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• Joystick acts as mouse; won't stop

  - by Shazzner

  Joystick acts as a mouse, even when I'm playing a game that uses a joystick so I get random mouse events going on. I plugged a joystick in to play Spiral Knights, also installed joystick and jcalibrate. Everything is working good, except by default the joystick moves the mouse around and the button activate mouse keys. Now normally this would be good behavior if I'm on a Myth-box or something, unfortunately when I play Spiral Knights with joystick input I see my mouse cursor moving in the back ground and when I hit a button it thinks I'm pressing right-click so it minimizes everything. Also it creates folders and probably deletes stuff. So, basically how the heck do I stop it from acting as a mouse?

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• Logitech M515 does not work after upgrade to 12.04

  - by user877329

  After upgrading to 12.04, my Logitech M515 does not work here is some output from the terminal: lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 003: ID 0411:002a BUFFALO INC. (formerly MelCo., Inc.) Bus 001 Device 004: ID 055d:3021 Samsung Electro-Mechanics Co. Bus 002 Device 002: ID 413c:2005 Dell Computer Corp. RT7D50 Keyboard Bus 004 Device 002: ID 0582:0074 Roland Corp. EDIROL UA-25 Bus 005 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver dmesg | grep Logitech [ 30.470528] logitech-djreceiver 0003:046D:C52B.0004: hiddev0,hidraw1: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:1d.3-2/input2 The cursor does not move. Also the mouse was working in 11.10 and is working in Windows NT 5.1.2600.

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• Elantech trackpad being identified as a logitech wheel mouse.

  - by Nathan Cox

  I recently purchased a Samsung RF510 laptop computer, which I absolutely love. However, upon installing Ubuntu 10.10 onto it I couldn't get the trackpad to function properly. It worked as a basic mouse (point and click) but had no functionality for edge scrolling or any of the multitouch settings the trackpad is capable of. After doing a lot of research I discovered the reason is a known issue where the Ubuntu kernel will improperly detect an Elantech trackpad as a logitech PS/2 wheel mouse, and as such will gain none of the functionality that seems to be coded for synaptics trackpads. The question I have is: does anyone know a way to get this working properly? This is my first time trying to run Ubuntu on a laptop (actually, it's my first laptop in the last 12 years) and I'm finding the experience to be intolerable without the basic scrolling/zooming/etc I've been used to using for as long as I can remember.

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• How to configure Logitech Marble trackball

  - by user27189

  You can configure it using xinput. I tested this in 11.10 and it works very nicely. This selection is from "Ubuntuwiki" Avoid using Hal for this release because it has known issues. Put the following into terminal, using gedit: Edit $HOME/bin/trackball.sh using this command: gedit $HOME/bin/trackball.sh Then paste this into the file: #!/bin/bash dev="Logitech USB Trackball" we="Evdev Wheel Emulation" xinput set-int-prop "$dev" "$we Button" 8 8 xinput set-int-prop "$dev" "$we" 8 1 # xinput set-int-prop "$dev" "$we" 8 1 # xinput set-int-prop "$dev" "$we Button" 8 9 # xinput set-int-prop "$dev" "$we X Axis" 8 6 7 # xinput set-int-prop "$dev" "$we Y Axis" 8 4 5 # xinput set-int-prop "$dev" "Drag Lock Buttons" 8 8 Make sure trackball.sh begins with #!/bin/bash. Make the script executable by running this: chmod +x $HOME/bin/trackball.sh` Add the following lines to $HOME/.bashrc, using gedit $HOME/.bashrc and put this in the file even if it is empty: xmodmap $HOME/.Xmodmap > /dev/null 2>&1 $HOME/bin/trackball.sh Edit $HOME/.Xmodmap using: gedit $HOME/.Xmodmap pointer = 1 8 3 4 5 6 7 9 Log out and back in and viola!

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• udev rule group ownership not working

  - by Tirithen

  I have added a udev rule for my Arduino, but the symlink gets the ownership "root root" instead of "root dialout". $ cat /etc/udev/rules.d/47-Arduino.rules SUBSYSTEM=="usb", ATTR{idVendor}=="2341", ATTR{idProduct}=="0001", MODE="0666", SYMLINK+="arduino", GROUP="dialout" $ ls -la /dev/ar* lrwxrwxrwx 1 root root 15 sep 8 11:02 /dev/arduino -> bus/usb/003/007 $ ls -la /dev/bus/usb/003/007 crw-rw-r-- 1 root dialout 189, 262 sep 8 11:12 /dev/bus/usb/003/007 My user is a member of the group "dialout" but I still get permission denied error when I'm trying to communicate with the device. There are no problems when I'm using the "default" device "/etc/ttyACM3". $ ls -la /dev/ttyACM3 crw-rw---- 1 root dialout 166, 3 sep 8 11:12 /dev/ttyACM3 I have tried to restart both the udev service and reboot my computer. How can I fix this?

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• udev rule gives wrong group ownership

  - by Tirithen

  I have added a udev rule for my Arduino, but the symlink gets the ownership "root root" instead of "root dialout". $ cat /etc/udev/rules.d/47-Arduino.rules SUBSYSTEM=="usb", ATTR{idVendor}=="2341", ATTR{idProduct}=="0001", MODE="0666", SYMLINK+="arduino", GROUP="dialout" $ ls -la /dev/ar* lrwxrwxrwx 1 root root 15 sep 8 11:02 /dev/arduino -> bus/usb/003/007 $ ls -la /dev/bus/usb/003/007 crw-rw-r-- 1 root dialout 189, 262 sep 8 11:12 /dev/bus/usb/003/007 My user is a member of the group "dialout" but I still get "Permission Denied" error when I'm trying to communicate with the device. There are also no problems when I'm using the "default" device "/etc/ttyACM3". $ ls -la /dev/ttyACM3 crw-rw---- 1 root dialout 166, 3 sep 8 11:12 /dev/ttyACM3 I have tried to restart both the udev service and reboot my computer. How can I fix this?

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• What are the files in /dev/input/ and what they do?

  - by Pouya

  I'm fairly new to ubuntu and I've started to search around everywhere and check everything! Recently I saw these files at /dev/input/eventX, js0, mice, mouseX. By printing the output using "cat" I realized they are somehow responsible for mouse and keyboard input but the output had an strange character encoding (even for the keyboard). My questions are, what are these files and how can I interpret the data of these files? Are there any other places that I can access the input/output of my Ubuntu machine? And are there any ebooks, manual or something similar that I can check the duty and structure of ubuntu system files? (i.e. to find the answer of such question)

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• In virtualbox, I can't access the dvd drive to install a guest host

  - by user211062

  I have installed a fresh copy of Ubuntu Server 12.04 and VirtualBox 4.3. I have set up a VM called "MediaServer" and tried to start it. I then get the following error: Cannot open host device '/dev/sr0' for readonly access. Check the permissions of that device ('/bin/ls -l /dev/sr0'): Most probably you need to be member of the device group. Make sure that you logout/login after changing the group settings of the current user (VERR_ACCESS_DENIED) I have looked all over the Internet and have been unable to find a solution. Using Webmin, I tried changing the group settings so that my user name was in the "vboxusers" group, but that did not work either. I tried various other changes in group settings and none of them worked. Also, I tried rebooting the server after the changes and that didn't work either. I have been following a guide on how to set up an Ubuntu server from the website "linuxhomeserverguide.com" and when it came to the section where you could finally set up your first virtual machine, I am stumped. I would really appreciate it if someone could help me. Thanks in advance.

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• Video works with 'Try me' but not after install. What is the difference? U12.04LTS,

  - by HarveyP

  My hard drive got corrupted so I did a reinstall. Tested Youtube in FF during 'try me' and it worked - jerky, but it worked. Instal without all the updates (576 outstanding now) in order to get ff installed as per the demo - to no avail. In 'try me' mode ff NEVER crashed! After install ff crashed whilst I was typing in 'youtube' in the address field. When I finally got to youtube - no video. What is the difference between ff in try me and ff after install? Off to try some selected updates now to see if I can see it for myself. In previous installation I had several profiles and aliased ff with -safe-mode switch to simplify startup of most stable ff. Also found that ff startup in graphic mode worked better (but still without video) with all of the extensions disabled and all of the plugins set to "ask" and always denied ... I have SiS graphic card in SiS Motherboard for XP and ancient Hyundai ImageQuest QV770 monitor. I have Ubuntu 12.04.01 LTS 1 day after install with only the immediate upgrades requested to language pack (English UK). Using FR Alternative keyboard. Connected with domestic wifi network from Orange (FT) I really want to use Skype, but won't bother installing it (again) without video as I can do my sms on FB - whilst ff is not crashed ... Update ... Is something overflowing? I have just had to reboot in order to get ff to restart in any way shape or form - restart on crash form generates new crash form, etc. It was however a good half hour before it crashed so some improvement over conditions before disk corruption. I have now installed all of the critical updates (332 recommended updates still outstanding) which included some relating to ff. Still no video. Still crashing - especially when on Grepolis website. Since the re-install I have had a lovely 1024x768 screen, but after last ff crash and reboot I got a message about 'low graphics mode' and 'setting things myself'. I was not sufficiently tuned in at the time to take proper note - I have no doubt I shall see it again and shall report accordingly. I still have only laptop options for my screen and do not know how to rectify this. Spent a few days with ubuntu on a different, newer machine which has now suffered a graphics breakdown. Returned to this old one again, but with new flat screen Monitor. Found SIS drivers for my graphics BUT it is intended for Red Hat 7.2. I chose this over the version for 7.0 because I thought what the hell, I might not be able to do anything with either of them but this is the later one ... The file will not open with software manager - found a similar problem on Overclock but it has not helped me to install this driver. File name is sis_drv.o-410 and it is currently idling away in my Downloads folder ... I have tried the solution offered on another sis problem, but this shows that my xserver-xorg-video-sis driver is up to date. I am now at a loss as to how to proceed if I can't install the latest sis driver from sis ... Does nobody know how FF changes from "try-me" to "installed"? Any time I MUST have video I reboot from the disk again, but this is tedious! Also one of the things I mock most about MS is the constant rebooting ... UPDATE 10/6/2014 I have installed chromium-browser - worse, crashes even more often than ff.I have installed epiphany - better; Video works but not the associated soundtrack.FireFox is version 14.01 in 'try me' and version 29.0 from my install. Would it be useful to try to downgrade FireFox in order to get video?

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• How to simulate a USB plug?

  - by Nicolas Delvaux

  I have an app that implements some automations when an USB key is plugged. While developing, I have to test it in a specific environment (derivative from Debian Squeeze). The app subscribe to HAL events via DBUS. The problem is: my desk is on the third floor while my test machines are in the basement. I would really like to have a way to simulate a USB plug. usbip does not work on Ubuntu. I can't manage to use the g_mass_storage module on Ubuntu (I lack the dummy_hcd module) and in Debian. Maybe it is possible to simulate a dbus call? My work station is on Ubuntu 12.04.

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• Cannot get ATI Drivers installed

  - by bittoast67

  I am trying to install the Catalyst driver. The best I can get is a strange resolution problem and firefox acts all wonkt. The worst I have gotten is low graphics mode in which I just reinstall Ubuntu. I have a HP Pavilion Dv7 laptop. With Radeon 3200 HD. I plan to try again with a fresh install of Ubuntu 12.4.3 as I have heard its the most compatible. This is what I have done: I have tried just the easy way of going to synaptic and installing the drivers that way. the fglrx package (not the fglrx update). And if memory serves I think that boots me into low graphics mode. So, fresh install of Ubuntu and tried again. I have done everything a couple times from this site (http://wiki.cchtml.com/index.php/Ubuntu_Precise_Installation_Guide) following every instruction to a T. That gets me something, such as a lowered fan speed and a much cooler computer, but I also lose most of my resolution. And displays says its the best resolution I can get. I also have a very screwy firefox. Using this method I can see AMD Catalyst Control Center in my dash (two of them really one administrator and one not) but when I try to open it it says no amd driver detected. So again, ubuntu reinstall. I have tried the GUI method from the Legacy driver I got from AMD's site. It runs through smoothly and at the very end after I exit the installer it gives me an error. I have also tried various other methods using terminal, as well as various different drivers (the one from the amd's site and the one suggested in the above link for my graphics card) both to no avail. When I try the method in the link on number 2, and I get the super low res and screwy fire fox. I type in, fglrxinfo ,and get a badrequest error. I have yet to type in fglrxinfo and get anything like what I am supposed to. UPDATE: I am now currently reinstalling Ubuntu 12.4. I tried the above mentioned link - thank you very much!- just to see on the previously failed driver attempt by following the purge commands. And to no avail when typing fglrxinfo I still get the badrequest thing. I will update again after a try with a true fresh install. Thanks again!! UPDATE: Alright everyone. Still no go. I have done everything word per word in the provided tutorial. I have rebooted my computer again to a fucked up resolution and this is what I get when typing fglrxinfo: $ fglrxinfo X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 153 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 12 Current serial number in output stream: 12 I would like to add that when installing this file: fglrx_8.970-0ubuntu1_amd64.deb I got this: Building initial module for 3.8.0-29-generic Error! Bad return status for module build on kernel: 3.8.0-29-generic (x86_64) Consult /var/lib/dkms/fglrx/8.970/build/make.log for more information. update-initramfs: deferring update (trigger activated) Processing triggers for ureadahead ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-29-generic Processing triggers for libc-bin ... ldconfig deferred processing now taking place Any ideas? Anyone? I cant for the life of me figure out what I am doing wrong.

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• Map caps-lock key to middle mouse click

  - by Stefano Palazzo

  Since I rarely use caps-lock, I'd like to map the key to a middle mouse click instead. I would also like to map Alt+Caps Lock to the original function of the caps lock key, should I ever need it. I can map any keyboard shortcut to xdotool click 2, but the Gnome Keyboard Shortcuts dialog won't let me assign a command to the caps-lock key, even with modifiers. I know this is a bit of a strange undertaking; How would I go about doing it?

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• Elantech trackpad being identified as a logitech wheel mouse

  - by user11895

  I recently purchased a Samsung RF510 laptop computer, which I absolutely love. However, upon installing Ubuntu 10.10 onto it I couldn't get the trackpad to function properly. It worked as a basic mouse (point and click) but had no functionality for edge scrolling or any of the multitouch settings the trackpad is capable of. After doing a lot of research I discovered the reason is a known issue where the Ubuntu kernel will improperly detect an Elantech trackpad as a logitech PS/2 wheel mouse, and as such will gain none of the functionality that seems to be coded for synaptics trackpads. The question I have is: does anyone know a way to get this working properly? This is my first time trying to run Ubuntu on a laptop (actually, it's my first laptop in the last 12 years) and I'm finding the experience to be intolerable without the basic scrolling/zooming/etc I've been used to using for as long as I can remember.

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• Touchpad and Keyboard both stop working after long uptime

  - by Sepero

  I have an Asus N53SM laptop that I leave running for several weeks at a time. I never put it in hibernate or suspend, I only close the lid when I'm not using it. After a few days or weeks of running, the touchpad and keyboard will Both lock up (at the same time) for no apparent reason. I could be just surfing the internet when it happens. The touchpad and keyboard seem to only lock up when I'm actively using the laptop (not when idle), which may mean it's related to something I press, but I'm not sure? The touchpad never locks or unlocks when Pressing FN and the designated touchpad lock key (it does not seem to work on Linux). While the touchpad and keyboard are locked, I am able to plug in my USB mouse and successfully use it to control the screen cursor. I can also remotely get into the system with vnc and ssh, everything seems to run fine there as well. No processes appear out of control. It's just the laptops physical touchpad and keyboard that are locking up. How might I go about diagnosing this problem? What system logs to look at? (anything specific to look for in them?) Perhaps I should try reloading some modules? Any thing else I should inspect?

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• Can't find my DVD drive in Ubuntu 12.04

  - by user72953

  I am completely new to Linux, due to some problems in my Windows I decided to give Linux a try. I am quite liking it accept for some minor issues. The biggest of them is that I cannot find my DVD drive in Ubuntu. After I insert the disk, the drive's green light flickers and then nothing. I don't get anything on my unity bar or desktop. There is no folder inside my /dev folder which indicates a dvd drive. There is a cdrom folder in my root folder but nothing is there. If you guys know what's wrong, I'd appreciate the help. Am a complete newbie so don't expect me to know anything about Ubuntu, although I have spent lots of hours in last 2 days googling my issue so I have basic information...

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• USB audio device not detected [solved]

  - by user199052

  I've been having problems with USB sound for some time (it used to work about 6 months ago). I find that any USB sound device that I connect is not recognised, and is not listed by aplay -l I've tried disabling pulseaudio. I've tried purging and re-installing alsa-base, pulseaudio, and pavucontrol. To no avail. I'm using 12.04 LTS. I found the solution: 12.04 does not have the needed kernel module snd-usb-hiface this is introduced in the 3.11.1 kernel and installing that on 12.04 gives USB sound for my equipment. How to install the 3.11.1 kernel is given here:- installing 3.11.1 kernel

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• How to buy a computer that supports multiple monitors?

  - by Curtis Gibby

  When shopping for a new desktop computer, I'd like to get one that allows me to use two monitors. Is that something that most current-generation video cards can do (in late 2012), or do I need to search for a specific graphics card, or specific attributes for a card? I've Googled the question but most answers talk about how to figure out if a computer that you already have can support dual monitors (generally, by plugging two monitors and seeing if they both work). Is there some key terminology that I'm missing in my searches?

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• Passing multiple POST parameters to Web API Controller Methods

  - by Rick Strahl

  ASP.NET Web API introduces a new API for creating REST APIs and making AJAX callbacks to the server. This new API provides a host of new great functionality that unifies many of the features of many of the various AJAX/REST APIs that Microsoft created before it - ASP.NET AJAX, WCF REST specifically - and combines them into a whole more consistent API. Web API addresses many of the concerns that developers had with these older APIs, namely that it was very difficult to build consistent REST style resource APIs easily. While Web API provides many new features and makes many scenarios much easier, a lot of the focus has been on making it easier to build REST compliant APIs that are focused on resource based solutions and HTTP verbs. But  RPC style calls that are common with AJAX callbacks in Web applications, have gotten a lot less focus and there are a few scenarios that are not that obvious, especially if you're expecting Web API to provide functionality similar to ASP.NET AJAX style AJAX callbacks. RPC vs. 'Proper' REST RPC style HTTP calls mimic calling a method with parameters and returning a result. Rather than mapping explicit server side resources or 'nouns' RPC calls tend simply map a server side operation, passing in parameters and receiving a typed result where parameters and result values are marshaled over HTTP. Typically RPC calls - like SOAP calls - tend to always be POST operations rather than following HTTP conventions and using the GET/POST/PUT/DELETE etc. verbs to implicitly determine what operation needs to be fired. RPC might not be considered 'cool' anymore, but for typical private AJAX backend operations of a Web site I'd wager that a large percentage of use cases of Web API will fall towards RPC style calls rather than 'proper' REST style APIs. Web applications that have needs for things like live validation against data, filling data based on user inputs, handling small UI updates often don't lend themselves very well to limited HTTP verb usage. It might not be what the cool kids do, but I don't see RPC calls getting replaced by proper REST APIs any time soon.  Proper REST has its place - for 'real' API scenarios that manage and publish/share resources, but for more transactional operations RPC seems a better choice and much easier to implement than trying to shoehorn a boatload of endpoint methods into a few HTTP verbs. In any case Web API does a good job of providing both RPC abstraction as well as the HTTP Verb/REST abstraction. RPC works well out of the box, but there are some differences especially if you're coming from ASP.NET AJAX service or WCF Rest when it comes to multiple parameters. Action Routing for RPC Style Calls If you've looked at Web API demos you've probably seen a bunch of examples of how to create HTTP Verb based routing endpoints. Verb based routing essentially maps a controller and then uses HTTP verbs to map the methods that are called in response to HTTP requests. This works great for resource APIs but doesn't work so well when you have many operational methods in a single controller. HTTP Verb routing is limited to the few HTTP verbs available (plus separate method signatures) and - worse than that - you can't easily extend the controller with custom routes or action routing beyond that. Thankfully Web API also supports Action based routing which allows you create RPC style endpoints fairly easily:RouteTable.Routes.MapHttpRoute( name: "AlbumRpcApiAction", routeTemplate: "albums/{action}/{title}", defaults: new { title = RouteParameter.Optional, controller = "AlbumApi", action = "GetAblums" } ); This uses traditional MVC style {action} method routing which is different from the HTTP verb based routing you might have read a bunch about in conjunction with Web API. Action based routing like above lets you specify an end point method in a Web API controller either via the {action} parameter in the route string or via a default value for custom routes. Using routing you can pass multiple parameters either on the route itself or pass parameters on the query string, via ModelBinding or content value binding. For most common scenarios this actually works very well. As long as you are passing either a single complex type via a POST operation, or multiple simple types via query string or POST buffer, there's no issue. But if you need to pass multiple parameters as was easily done with WCF REST or ASP.NET AJAX things are not so obvious. Web API has no issue allowing for single parameter like this:[HttpPost] public string PostAlbum(Album album) { return String.Format("{0} {1:d}", album.AlbumName, album.Entered); } There are actually two ways to call this endpoint: albums/PostAlbum Using the Model Binder with plain POST values In this mechanism you're sending plain urlencoded POST values to the server which the ModelBinder then maps the parameter. Each property value is matched to each matching POST value. This works similar to the way that MVC's  ModelBinder works. Here's how you can POST using the ModelBinder and jQuery:$.ajax( { url: "albums/PostAlbum", type: "POST", data: { AlbumName: "Dirty Deeds", Entered: "5/1/2012" }, success: function (result) { alert(result); }, error: function (xhr, status, p3, p4) { var err = "Error " + " " + status + " " + p3; if (xhr.responseText && xhr.responseText[0] == "{") err = JSON.parse(xhr.responseText).message; alert(err); } }); Here's what the POST data looks like for this request: The model binder and it's straight form based POST mechanism is great for posting data directly from HTML pages to model objects. It avoids having to do manual conversions for many operations and is a great boon for AJAX callback requests. Using Web API JSON Formatter The other option is to post data using a JSON string. The process for this is similar except that you create a JavaScript object and serialize it to JSON first.album = { AlbumName: "PowerAge", Entered: new Date(1977,0,1) } $.ajax( { url: "albums/PostAlbum", type: "POST", contentType: "application/json", data: JSON.stringify(album), success: function (result) { alert(result); } }); Here the data is sent using a JSON object rather than form data and the data is JSON encoded over the wire. The trace reveals that the data is sent using plain JSON (Source above), which is a little more efficient since there's no UrlEncoding that occurs. BTW, notice that WebAPI automatically deals with the date. I provided the date as a plain string, rather than a JavaScript date value and the Formatter and ModelBinder both automatically map the date propertly to the Entered DateTime property of the Album object. Passing multiple Parameters to a Web API Controller Single parameters work fine in either of these RPC scenarios and that's to be expected. ModelBinding always works against a single object because it maps a model. But what happens when you want to pass multiple parameters? Consider an API Controller method that has a signature like the following:[HttpPost] public string PostAlbum(Album album, string userToken) Here I'm asking to pass two objects to an RPC method. Is that possible? This used to be fairly straight forward either with WCF REST and ASP.NET AJAX ASMX services, but as far as I can tell this is not directly possible using a POST operation with WebAPI. There a few workarounds that you can use to make this work: Use both POST *and* QueryString Parameters in Conjunction If you have both complex and simple parameters, you can pass simple parameters on the query string. The above would actually work with: /album/PostAlbum?userToken=sekkritt but that's not always possible. In this example it might not be a good idea to pass a user token on the query string though. It also won't work if you need to pass multiple complex objects, since query string values do not support complex type mapping. They only work with simple types. Use a single Object that wraps the two Parameters If you go by service based architecture guidelines every service method should always pass and return a single value only. The input should wrap potentially multiple input parameters and the output should convey status as well as provide the result value. You typically have a xxxRequest and a xxxResponse class that wraps the inputs and outputs. Here's what this method might look like:public PostAlbumResponse PostAlbum(PostAlbumRequest request) { var album = request.Album; var userToken = request.UserToken; return new PostAlbumResponse() { IsSuccess = true, Result = String.Format("{0} {1:d} {2}", album.AlbumName, album.Entered,userToken) }; } with these support types:public class PostAlbumRequest { public Album Album { get; set; } public User User { get; set; } public string UserToken { get; set; } } public class PostAlbumResponse { public string Result { get; set; } public bool IsSuccess { get; set; } public string ErrorMessage { get; set; } }   To call this method you now have to assemble these objects on the client and send it up as JSON:var album = { AlbumName: "PowerAge", Entered: "1/1/1977" } var user = { Name: "Rick" } var userToken = "sekkritt"; $.ajax( { url: "samples/PostAlbum", type: "POST", contentType: "application/json", data: JSON.stringify({ Album: album, User: user, UserToken: userToken }), success: function (result) { alert(result.Result); } }); I assemble the individual types first and then combine them in the data: property of the $.ajax() call into the actual object passed to the server, that mimics the structure of PostAlbumRequest server class that has Album, User and UserToken properties. This works well enough but it gets tedious if you have to create Request and Response types for each method signature. If you have common parameters that are always passed (like you always pass an album or usertoken) you might be able to abstract this to use a single object that gets reused for all methods, but this gets confusing too: Overload a single 'parameter' too much and it becomes a nightmare to decipher what your method actual can use. Use JObject to parse multiple Property Values out of an Object If you recall, ASP.NET AJAX and WCF REST used a 'wrapper' object to make default AJAX calls. Rather than directly calling a service you always passed an object which contained properties for each parameter: { parm1: Value, parm2: Value2 } WCF REST/ASP.NET AJAX would then parse this top level property values and map them to the parameters of the endpoint method. This automatic type wrapping functionality is no longer available directly in Web API, but since Web API now uses JSON.NET for it's JSON serializer you can actually simulate that behavior with a little extra code. You can use the JObject class to receive a dynamic JSON result and then using the dynamic cast of JObject to walk through the child objects and even parse them into strongly typed objects. Here's how to do this on the API Controller end:[HttpPost] public string PostAlbum(JObject jsonData) { dynamic json = jsonData; JObject jalbum = json.Album; JObject juser = json.User; string token = json.UserToken; var album = jalbum.ToObject<Album>(); var user = juser.ToObject<User>(); return String.Format("{0} {1} {2}", album.AlbumName, user.Name, token); } This is clearly not as nice as having the parameters passed directly, but it works to allow you to pass multiple parameters and access them using Web API. JObject is JSON.NET's generic object container which sports a nice dynamic interface that allows you to walk through the object's properties using standard 'dot' object syntax. All you have to do is cast the object to dynamic to get access to the property interface of the JSON type. Additionally JObject also allows you to parse JObject instances into strongly typed objects, which enables us here to retrieve the two objects passed as parameters from this jquery code:var album = { AlbumName: "PowerAge", Entered: "1/1/1977" } var user = { Name: "Rick" } var userToken = "sekkritt"; $.ajax( { url: "samples/PostAlbum", type: "POST", contentType: "application/json", data: JSON.stringify({ Album: album, User: user, UserToken: userToken }), success: function (result) { alert(result); } }); Summary ASP.NET Web API brings many new features and many advantages over the older Microsoft AJAX and REST APIs, but realize that some things like passing multiple strongly typed object parameters will work a bit differently. It's not insurmountable, but just knowing what options are available to simulate this behavior is good to know. Now let me say here that it's probably not a good practice to pass a bunch of parameters to an API call. Ideally APIs should be closely factored to accept single parameters or a single content parameter at least along with some identifier parameters that can be passed on the querystring. But saying that doesn't mean that occasionally you don't run into a situation where you have the need to pass several objects to the server and all three of the options I mentioned might have merit in different situations. For now I'm sure the question of how to pass multiple parameters will come up quite a bit from people migrating WCF REST or ASP.NET AJAX code to Web API. At least there are options available to make it work.© Rick Strahl, West Wind Technologies, 2005-2012Posted in Web Api   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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• Upgrading from 13.04 to 13.10 stops

  - by BuZZ-dEE

  The upgrade to 13.10 stops after a lot of error messages about texlive packages, that I could close. The upgrade goes then further, but now it is stopped. What can I do to initiate the process again? The following are the last messages from the command window.: g multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 47: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 47: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 47: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 47: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 59: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 59: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 59: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 59: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 59: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 72: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 86: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 86: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 86: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 98: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 98: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 109: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 116: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 130: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 130: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 130: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 130: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 130: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 130: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 138: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 146: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 157: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 157: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 157: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 157: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 165: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 173: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 182: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/30-cjk-aliases.conf", line 182: Having multiple <family> in <alias> isn't supported and may not work as expected Fontconfig warning: "/etc/fonts/conf.d/99-language-selector-zh.conf", line 11: Having multiple values in <test> isn't supported and may not work as expected ERROR: error('unpack requires a bytes object of length 4',) (apport-gtk:16828): Gtk-CRITICAL **: gtk_main_quit: assertion 'main_loops != NULL' failed

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• VMware virtual machine network devices malfunctioning

  - by sheepz

  I'm running Ubuntu 10.04 LTS and VMvware workstation 7.0.1 build-227600. The virtual machine i'm running in VMware is a custom distribution built on Debian Linux version 3.1. I'm still pretty much a beginner with UNIX administration. After having messed around with the vmware (changed only the name of the folder, the vmx and and other .v* files accordingly in which the .vmx was situated, and the configuration in the vmx file accordingly), the network devices on the virtual machine do not work anymore. The virtual machine is used for securely sending messages. The virtual machine: As far as I know, this perl file called proxy-gen-ifalias eth0 is responsible for properly setting up the two virtual network devices eth0 and eth1. The Virtual machine comes with a GUI interface in which I have set up two ethernet network devices, one internal, the other external. Now, after having messed around with this, the UI gives me this error message: perl proxy-gen-ifalias eth0 /etc/modprobe.d/alias-eth0 /sbin/update-modules perl proxy-gen-ifalias eth1 /etc/modprobe.d/alias-eth1 /sbin/update-modules ifdown eth0 ifdown: interface eth0 not configured ifdown eth1 ifdown: interface eth1 not configured perl proxy-gen-netcfg /etc/network/interfaces ifup eth0 SICCSIFADDR: No such device eth0: ERROR while getting interface flags: No such device SIOCSIFNETMASK: No such device eth0: ERROR while getting interface flags: No such device Failed to bring up eth0. ifconfig eth0 eth0: error fetching interface information: Device not found make: *** [/etc/network/interfaces] Error 1 ~ Here are the contents of the two perl files referred to in the message: paste.pocoo.org/show/2AMzAYhoCRZqlGY7wUFk/ proxy-gen-netcfg

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• Central Authentication For Windows, Linux, Network Devices

  - by mojah

  I'm trying to find a way to centralize user management & authentication for a large collection of Windows & Linux Servers, including network devices (Cisco, HP, Juniper). Options include RADIUS/LDAP/TACACS/... Idea is to keep track with staff changes, and access towards these devices. Preferably a system that is compatible with both Linux, Windows & those network devices. Seems like Windows is the most stubborn of them all, for Linux & Network equipment it's easier to implement a solution (using PAM.D for instance). Should we look for an Active Directory/Domain Controller solution for Windows? Fun sidenote; we also manage client systems, that are often already in a domain. Trust-relationships between Domain Controllers isn't always an option for us (due to client security restrictions). I'd love to hear fresh ideas on how to implement such a centralized authentication "portal" for those systems.

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• Known USB 2.0 devices don't install driver, but must be manually forced

  - by Darragh

  When a known USB 2.0 device is plugged in and detected, it doesn't install the driver correctly but shows a Code 28 error and lists the device under "Other Devices" in Device Manager. When view properties of this device , it shows the following status; The drivers for this device are not installed. (Code 28) There is no driver selected for the device information set or element. To find a driver for this device, click Update Driver. When updating the driver manually and selecting the appropriate driver Windows doesn't believes it's the correct driver, but you can force the installation and it works! The other condition the driver will auto-install is when the same USB device is plugged into a USB 3.0 port. Power related issues are not also causing this as I have tried vi a Docking station, USB hub. etc.. Devices tried; Jabra Headset USB-Mass Storage Device (flash disk and ext HD) MS Wireless Keyboard & Mouse USB Ethernet controller (USB-MAC controller) This is on a laptop part of a Domain with Windows 7 Ent 7601, I am logged in as a local administrator. There isn't any Group Policies blocking not signed driver or whitelisted devices on the domain. Any suggestions please feel free

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• How are video card\graphics drivers written exactly? [closed]

  - by Bigyellow Bastion

  I was thinking, since I want an application layer for my operating system, how or what would be the best way to write, or better understand how to write, my own graphics device drivers or software to enable application layered software to request data through my graphics system (I.e. windows, icons, mouse pointers). I don't need every little detail, I'd just like some possible insight on the procedure one may accomplish this feat in, perhaps the best way to understand the interaction between the graphics GUI rendering software to the hardware interaction directly, and the application software requesting the graphics driver itself.

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• Wacom Bamboo CTH460L issues

  - by Robert Smith

  I recently bought a Wacom Bamboo Pen & Touch CTH460L. I installed doctormo's PPA, however, the pen functionality didn't work and the touch was very glitchy (when I touched it, it immediately double clicked and began to drag elements in the screen). I tried to configure it using the wacom-utility package in the Synaptic Package Manager (version 1.21-1) but that didn't work either. Then I followed this post (#621, written by aaaalex), and after some problems trying to restart Ubuntu (graphics related problems), the pen works fine (it could be better, though) but the touch functionality doesn't work anymore. Currently I have installed xserver-xorg-input-wacom (1:0.10.11-0ubuntu7), wacom-dkms (0.8.10.2-1ubuntu1) and wacom-utility. The Wacom Utility only displays an "options" field under "Wacom BambooPT 2FG 4X5" but no other option to configure it. What is the correct way to get this tablet working on Ubuntu 10.04?. By the way, currently I can't start Ubuntu properly when the tablet is connected (in that case, Ubuntu start in low graphics mode). I need to connect it later. UPDATE: I uninstalled xserver -xorg-input-wacom, and wacom-utility because one of them prevented Ubuntu to start normally. I only re-installed wacom-dkms 0.8.10.2-1ubuntu1. The pen is working but no touch functionality. The side buttons don't work either. Thanks in advance.

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• Cedarview drivers boot to a blank screen

  - by map7

  I'm following the tutorial following tutorial to get my Intel D2700DC motherboard's graphics working: http://daily.siebler.eu/2012/06/ubuntu-12-04-driver-for-intel-cedarview-atom-n2000-und-d2000-serie/ When I boot I'm getting a blank screen. I followed the tutorial and read all the comments. I've also tried: Install gdm and use this instead of lightdm (ubuntu default) sudo apt-get install gdm Remove previous pae kernel: http://www.liberiangeek.net/2011/11/remove-old-kernels-in-ubuntu-11-10-oneiric-ocelot/ Reboot before adding cedarview packages. Have tried with and without the "video=LVDS-1:d" to GRUB_CMDLINE_LINUX_DEFAULT variable in /etc/default/grub I still get a blank screen. I am plugged into a HD screen through the HDMI and have tried the DVI connector also. I can see the grub menu, then a little of the loading and then 'No signal'. I can still ssh into the box though so it is logging in. lspci -v -s 00:02.0 00:02.0 VGA compatible controller: Intel Corporation Atom Processor D2xxx/N2xxx Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller]) Subsystem: Intel Corporation Device 2011 Flags: bus master, fast devsel, latency 0, IRQ 45 Memory at 80100000 (32-bit, non-prefetchable) [size=1M] I/O ports at 20d0 [size=8] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: pvrsrvkm Kernel modules: cedarview_gfx uname -a Linux test-desktop 3.2.0-35-generic #55-Ubuntu SMP Wed Dec 5 17:45:18 UTC 2012 i686 i686 i386 GNU/Linux

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