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• How can I get nvidia-settings to work?

  - by Palace Chan

  I have an ASUS N56VM-TB71 with a GeForce 630M graphics card. I have ubuntu 12.04 and when I vga plugged in a dell monitor, i am able to use it. When I then use my laptops hdmi port to plug in my second monitor, nothing happens, so I went to nvidia-settings and I got the error: You do not appear to be using the NVIDIA X Driver, please run nvidia-xconfig as root and restart the X server. I ran this command and rebooted but I still cannot access nvidia-settings and I keep getting that error even though my /etc/X11/xconf.org is the one that got generated by running that command! What can I do to get around that and use my second monitor as well?

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• Using the full tty real estate with sqlplus

  - by katsumii

  I believe 'rlwrap' is widely used for adding 'sqlplus' the history function and command line editing. 'rlwrap' has other functions and here's my kludgy alias to force sqlplus to use the full real estate of yourtty. Be it PuTTy session from Windows or Linux gnome terminal. $ declare -f sqlplus sqlplus () { PRE_TEXT=$(resize |sed -n "1s/COLUMNS=/set linesize /p;2s/LINES=/set pagesize /p"|while read line; do printf "%s \ " "$line";done); if [ -z "$1" ]; then rlwrap -m -P "$PRE_TEXT" sqlplus /nolog; else if ! echo $1 | grep '^-' > /dev/null; then rlwrap -m -P "$PRE_TEXT connect $*" sqlplus /nolog; else command sqlplus $*; fi; fi }

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• Partial Submit vs. Auto Submit

  - by Frank Nimphius

  Partial Submit ADF Faces adds the concept of partial form submit to JavaServer Faces 1.2 and beyond. A partial submit actually is a form submit that does not require a page refresh and only updates components in the view that are referenced from the command component PartialTriggers property. Another option for refreshing a component in response to a partial submit is call AdfContext.getCurrentInstance.addPartialTarget(component_instance_handle_goes_here)in a managed bean. If a form contains required fields that the user left empty invoking the partial submit, then errors are shown for each of the field as the full form gets submitted. Autosubmit An input component that has its autosubmit property set to true also performs a partial submit of the form. However, this time it doesn't submit the entire form but only the component that triggers the submit plus components referenced it in their PartialTriggers property. For example, consider a form that has three input fields inpA, inpB and inpC with autosubmit=true set on inpA and required=true set on inpB and inpC. use case 1: Running the view, entering data into inpA and then tabbing out of the field will submit the content for inpA but not for inpB and inpC. Further more, none of the required field settings on inpB and inpC causes an error. use case 2: You change the configuration of inpC and set its PartialTriggers property to point to the ID of component inpA. When rerunning the sample, entering a value into inpA and tabbing out of the field will now submit the inpA and inpC fields and thus show an error for the missing required value on inpC. Internally, using autosubmit=true on an input component sets the event root to just this field, which good to have in case of dependent field validation or behavior. The event root can extended to include other components by using the Partial Triggers property on these components to point to the input field that has autosubmit=true defined. PartialSubmit vs. AutoSubmit Partial submit set on a command component submits the whole form and leaves it to the developer to decide which UI component is refreshed in response. Client side required field validation (as well as the server side equivalent) is not disabled by executed in this scenario. Setting immediate=true on the command item to skip validation doesn't help as it would also skip the model update. Auto submit is a functionality on the input components and also performs a partial form submit. However, in addition an event root is defined that narrows the scope for the submitted data and thus the components that are validated on the request. To read more about this topic, see: http://docs.oracle.com/cd/E23943_01/web.1111/b31973/af_lifecycle.htm#CIAHCFJF

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• Live CD has black screen HP DV6

  - by Shaun Killingbeck

  Attempting to install/try ubuntu (11.10, 12.04) on my new laptop, using a liveCD (and tried USB). I get the purple screen (with the man/keyboard at the bottom) and after that the screen flashes bright white before going black. Ubuntu continues to load in the background, with login sound etc but the screen is off. I have tried as many different solutions as I could find including: using nomodestep, xforcevesa, i915.modeset=0, and also now i915.modeset=1 in boot options (seperately): varying consequences, but either I end up at a blinking cursor with no prompt, a command line (startx fails: no screen found), or the original blank screen again Tried booting from VirtualBox - it crashes at the same place the screen would go blank when using a CD/USB tried 11.04: I don't have this problem BUT when trying to install, I get a ubi-partman error 141 (possibly down to the three partitions that came on my laptop... not sure why HP needed there own separate partition for HP Tools...) Model: HP Pavillion DV6 6B08SA Processor: AMD Quad-Core A6-3410MX APU with Radeon HD 6545G2 Dual Graphics (1.6 GHZ 4 MB L2 cache ) Chipset: AMD RS880M Any help would be greatly appreciated. I just want to be able to partition the drive and install Ubuntu. I'm assuming the issue is graphics card related, although I have no confirmation of that. Update: Tried the ?orkarounds on https://wiki.ubuntu.com/X/Troubleshooting/BlankScreen - set gfxpayload=text changed nothing, removing splash did nothing and setting vesafb.nonsense=1 did nothing either. I'd like to be able to collect some log information somehow, but I can't get to a command line from the liveCD. tried using the latest 12.04 beta, same issue tried nomodeset without splash or quiet. get the following (tail of) output before it freezes on that screen: * Starting configure network device security [OK] * Starting configure network device [OK] [ 25.720899] ieee80211 phy0: w1_ops_config: change monitor mode: false (implement) [ 25.720923] ieee80211 phy0: w1_ops_config: change power-save mode: false (implement) * Starting restore sound card(s') mixer state(s) [fail] [ 25.721849] ieee80211 phy0: w1_ops_bss_info_changed: qos enabled: false (implement) * Stopping save kernel messages [OK] * Starting bluetooth [OK] * PulseAudio configured for per-user sessions saned disabled; edit /etc/default/saned [ 25.988016] hci_cmd_timer: hci0 command tx timeout [ 26.207225] bad LUN (0:1) [ 26.223735] bad target number (1:0) [ 26.252111] bad target number (2:0) [ 26.272170] bad target number (3:0) [ 26.300154] bad target number (4:0) [ 26.328162] bad target number (5:0) [ 26.344180] bad target number (6:0) [ 26.368142] bad target number (7:0) * Checking battery state... [OK] * Stopping System V runlevel capability [OK] Does this give any indication of the problem? the false (implement) messages also reappear when I press the power button to ask it to shutdown, followed by a [fail] status for killing remaining processes.

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• Who should control navigation in an MVVM application?

  - by SonOfPirate

  Example #1: I have a view displayed in my MVVM application (let's use Silverlight for the purposes of the discussion) and I click on a button that should take me to a new page. Example #2: That same view has another button that, when clicked, should open up a details view in a child window (dialog). We know that there will be Command objects exposed by our ViewModel bound to the buttons with methods that respond to the user's click. But, what then? How do we complete the action? Even if we use a so-called NavigationService, what are we telling it? To be more specific, in a traditional View-first model (like URL-based navigation schemes such as on the web or the SL built-in navigation framework) the Command objects would have to know what View to display next. That seems to cross the line when it comes to the separation of concerns promoted by the pattern. On the other hand, if the button wasn't wired to a Command object and behaved like a hyperlink, the navigation rules could be defined in the markup. But do we want the Views to control application flow and isn't navigation just another type of business logic? (I can say yes in some cases and no in others.) To me, the utopian implementation of the MVVM pattern (and I've heard others profess this) would be to have the ViewModel wired in such a way that the application can run headless (i.e. no Views). This provides the most surface area for code-based testing and makes the Views a true skin on the application. And my ViewModel shouldn't care if it displayed in the main window, a floating panel or a child window, should it? According to this apprach, it is up to some other mechanism at runtime to 'bind' what View should be displayed for each ViewModel. But what if we want to share a View with multiple ViewModels or vice versa? So given the need to manage the View-ViewModel relationship so we know what to display when along with the need to navigate between views, including displaying child windows / dialogs, how do we truly accomplish this in the MVVM pattern?

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• Improving the performance of JDeveloper11g (part 2) and JVMs in general

  - by asantaga

  Just received an email from one of our JVM developers who read my blog entry on Performance tuning JDeveloper11g and he's confirmed that all of the above parameters are totally supported :-) He's also provided a description of the parameters so we can learn what magic is actually being applied. - -XX:+AggressiveOpts -- this enables the latest and greatest JVM optimizations. It will likely help most Java applications. It's fully supported. The downside of it is that because it has the latest and greatest optimizations, there is some small probability that it may not offer as good of an experience. As those features enabled with this command line option have "matured", they are made the default in a future JDK release. So, you can think of this command line option as the place where the newest optimizations get introduced. Some time later they are moved out from under AggressiveOpts to become default behavior. -XX:+OptimizeStringConcat -- only works with the -server JVM. It may be enabled by the default in a future JDK 7 update release. This option delays the construction of a StringBuilder/StringBuffer and attempts to avoid re-sizing the underlying char[] by attempting to detect the size of the char[] to allocate based on what's being appended to the StringBuilder/StringBuffer. -XX:+UseStringCache -- I would not suggest using this unless you knew that JDeveloper allocated the same string over and over again. And, the string that's allocated over and over again is one of the first 100,000 allocated strings. In short, I'd recommend against using it. And, in fact, in Java 7 (currently) does not include this feature. -XX:+UseCompressedOops -- applicable to 64-bit JVMs. And, if you're using a 64-bit JVM, I'd suggest you use it. It's auto enabled in JDK 7 64-bit JVMs and later JDK 6 64-bit JVMs enable it by default too. -XX:+UseGCOverheadLimit -- by default this option is already enabled. One other command line option to consider is -XX:+TieredCompilation for a JDK 6 Update 25 or later, or JDK 7. This gives you the startup of a -client JVM and the peak performance of a -server JVM. Awesome-ness!  Finally, Charlies also pointed out to me a "new" book he's just published where he goes into the details of JVM tuning, a must for all Fusion Middleware tuning exercises..  (click the book)  Thanks Charlie!

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• "make" and "make install" never work

  - by Nirmik

  I have been trying it from a long time now and this time it got my nerves... The commands make and make install used to install a program from an extracted tar ball never work for some reason... The make command gives me the error- make: *** No targets specified and no makefile found. Stop. and the make install command gives me the error make: *** No rule to make target `install'. Stop. Why are these commands not executing? What should I do to solve this issue?

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• Setup shortcut keys not working

  - by Tim

  In my Ubuntu 12.04, in keyboard settings, I didn't find a shortcut key for restarting X, so in "Customer Shorcut", I set up Ctrl+Alt+Backspace for command sudo restart lightdm. But after that the shortcut doesn't work. Is it because it requires root privilege? Also I have a SysRq key on my keyboard, which I think to be the "Magic SysReq Key". My SysRq key is shared with PrtSc key (for screen shoot), and is in blue which means I have to press Fn key at the same time to invoke SysRq instead of PrtSC. But every time I press Fn+SysRq, it always shoots a photo of the screen, same as just hitting PrtSc i.e. without hitting Fn. I wonder how to use the Magic SysReq Key? Does it mean the shortcut has not been linked to any command that is supposed for Magic SysReq Key yet? PS: My laptop is Lenovo T400 and OS is Ubuntu 12.04. Thanks!

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• Install AMDCONFIG on Ubuntu driver

  - by Nick Bailuc

  In 12.04 I used the official driver downloaded from amd.com which came with amdconfig but now in 14.04 the official driver is buggy so I just use the Ubuntu Official Drivers which works even better because they beefed up the original driver. The Ubuntu driver doesnt come with the terminal command amdconfig which allowed me to tweak/overclock my graphics card. How can I install it without having to install the original AMD driver? Additional Information: -I only use x.org drivers becuase it's opensource therefore more stable rather than the proprietary fglrx driver -I do not use procrams like amdoverdrivectrl or atioverclock because they are not as stable and advanced as the terminal command

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• Rails version not shown post installation

  - by mgj

  Hi all, I had installed rubygems 1.8 and further on I had installed the rails 2.0.2 gem. When I tried to view the rails version installed through the command rails -v It didn't work.. I am unable to figure out why I am getting an "invalid option" on executing the command rails -v ( Please refer the below for the same). mohnish@mohnish-laptop:~/Downloads$ ruby -v ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux] mohnish@mohnish-laptop:~/Downloads$ gem list *** LOCAL GEMS *** actionmailer (2.0.2) actionpack (2.0.2) activerecord (2.0.2) activeresource (2.0.2) activesupport (2.0.2) rails (2.0.2) rake (0.8.7) mohnish@mohnish-laptop:~/Downloads$ rails -v getopt: invalid option -- 'v' Terminating... mohnish@mohnish-laptop:~/Downloads$ Could you please help me out on this regard.. Please note I am currently not making use of the ruby version manager(rvm). Please let me know if I could get a solution once I install the rvm. Thanks for your help..

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• Where can I get a list of SCHEMA / PATH / KEY to use with gsettings?

  - by Sri

  After doing some research, I found that I can quickly set configuration options using the gsettings command in the terminal, instead of installing dconf-editor or gconf-editor or CCSM. But we need the SCHEMA/PATH and KEY to set the value. Syntax is: gsettings set SCHEMA[:PATH] KEY VALUE For example to never auto-hide the launcher: gsettings set com.canonical.Unity2d.Launcher hide-mode 0 And, for windows not to overlap the launcher: gsettings set com.canonical.Unity2d.Launcher use-strut true So, where can I get a list of all the SCHEMA / PATH / KEY that can be set with gsettings? No, please don't suggest the gsettings list-keys command, because I don't know the possibly hundreds of schema available.

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• Why does terminal auto complete sometimes not suggest anything?

  - by alex

  Sometimes, when I type a command on the terminal, the terminal's autocomplete does not work, even if my command is not wrong. For example, take look to this: sudo service vsftpd status sudo and service do not have any problem. I mean, when you type sud +tab terminal suggest you sudo or I type servi + tab terminal complete that to service. But for vsftpd I do not get any suggestion. Is there a way to say, "terminal, please tell me any suggestion!!?".

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• Override Built-In Maverick Keyboard Shortcuts

  - by jrc03c

  Having used the Command+M keyboard shortcut to minimize windows in OS X, I'd like to use the same functionality in Ubuntu 10.10. When I try, though, it only brings up the "communications" section of the indicator applet; like so: In the Keyboard Shortcuts preferences, I have set as the minimize shortcut Mod4+M, which I got by capturing the Apple Command key and the M key. I find no other shortcut using this key combination in Keyboard Shortcuts, and yet I cannot get the window to minimize when using it. Does anyone know how to override Ubuntu's default usage of this key combination? Thanks!

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• Find PublicKeyToken easily

  - by Sahil Malik

  SharePoint 2010 Training: more information This tip will make it easy for you to get that assembly name right within Visual Studio.This applies to both SP2010 and SP2007 or General .NET. In Visual Studio, Go to Tools –>  External Tools. Click on “Add” to add a tool, and put in the following values: Title: S&trong Name Command: Powershell.exe Arguments: -command "[System.Reflection.AssemblyName]::GetAssemblyName(\"$(TargetPath)\").FullName" Check “Use Output Window” Uncheck everything else – here’s how it should look - 3. That’s it, now in your project, Visit Tools –> Strong Name, and in the output window, itwill give you the assembly name like this –> SandBoxWebPartWithProxy, Version=1.0.0.0, Culture=neutral, PublicKeyToken=64b818b3ff69ccfa Read full article ....

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• How do I install the Intel 82845 graphics driver -- videos are really slow?

  - by Mahesh Bhat

  I installed lubuntu on my machine and seems Intel 82845 graphics wasn't installed. Videos are showing frame by frame. Many says ubuntu kernel has built in support for it. but seems it is not. There is a website www.intellinuxgraphics.org has drivers for many kinds of linux distributions. But I find it difficult how to install them on my lubuntu. Can anyone elabroate on how that can be installed ? Output of the command dmesg http://paste.ubuntu.com/1058720/ Output of the command lsmod http://paste.ubuntu.com/1058724/

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• Xubuntu, LXDE, USB Booting

  - by Kosciak

  Welcome, My problem appeared today - I was using Xubuntu for a long time, but find out that LXDE should be faster than Xfce, so I installed it. After installing I followed tutorial for removing Xfce, cause disk in my computer is very small and I wanted to release some free space. I used command from this tutorial: How to remove xubuntu-desktop? but instead of remove I entered purge command… and rebooted at the end. And I uninstalled whole my things. The problem is in installing system again - it's old Sony Vaio laptop (PCG-GR250) and I have broken CD-DVD drive. It's possible to boot from USB? I can access recovery mode, will this help me? Please answer fast, because it's my brother computer, and his going to kill me if I won't fix this fast :(

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• how to make Chromium-browser start on vnc display?

  - by Oleksandr Dudchenko

  I have started Tightvncserver on Lubuntu 12.04 via the command $ tightvncserver -geometry 800x600 -depth 16 :2 VNC server successfully started and I got message like follows. New 'X' desktop is gateway:2 Starting applications specified in /home/dolv/.vnc/xstartup Log file is /home/dolv/.vnc/gateway:2.log Then I've successfully loged in from remote PC using realvncclient. Trying to start Chromium-browser from menu... no luck. There was one more attempt: I opened the LXTerminal from menu. Trying to start is from terminal with the command /usr/bim/chromium-browser & it returned the message like follows: Xlib: extention "RANDR" missing on desktop :2 I have also discovered that after my two attampts the chromium-browser has created 2 new windows on the host on which was session running on display :0 The Question: How to make the browser start on that display from which it was called (in my occasion from vnc session display)?

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• Juju bootstrap fails to start network on local environment

  - by Amith KK

  I've followed the instructions at https://juju.ubuntu.com/CharmSchool and rebooted 5 times...... I cant seem to do a juju-bootstrap (local) This is the output: amith@amith-desktop:~$ juju bootstrap 2011-11-24 17:08:05,708 INFO Bootstrapping environment 'local' (type: local)... 2011-11-24 17:08:05,710 INFO Checking for required packages... 2011-11-24 17:08:06,593 INFO Starting networking... error: Failed to start network default error: internal error Child process (dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override) status unexpected: exit status 2 Command '['virsh', 'net-start', 'default']' returned non-zero exit status 1 2011-11-24 17:08:07,217 ERROR Command '['virsh', 'net-start', 'default']' returned non-zero exit status 1 Is there any fix at all?

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• Cannot see shared folder in /mnt/hgfs

  - by blasto

  I am trying to share a folder between Lubuntu 13.04 (in VMware player) and Windows 7 64 bit. I followed a tutorial till step 16. I typed a command and saw nothing. I also went into the /mnt/hgfs folder and saw nothing there. How do I fix this ? http://theholmesoffice.com/how-to-share-folders-between-windows-and-ubuntu-using-vmware-player/ Command - dir /mnt/hgfs EXTRAS - By the way, this is how I actually reached step 16. Step 12 - sudo apt-get install hgfsclient Step 14 - If it does not work, then follow this tutorial - http://www.liberiangeek.net/2013/03/how-to-quickly-install-vmware-tools-in-ubuntu-13-04-raring-ringtail/ Step 16 - STUCK !!!

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• convert video file to .ogg

  - by Levan

  I've been having trouble with this because I'm new to Linux: I would like to convert different video formats to ogv. I found some terminal commands like this: ffmpeg -i input.avi -acodec libvorbis -ac 1 -b 768k output.ogg The problem with these type of commands is that they are intended to change bit rate, fps, or even resolution. I would like to just change the file format without changing anything else about the video. I looked at the man pages for ffmpeg and found some useful info but I don't know how to space command-line options. Are there any easy ways to do this? In addition, is there a command to change the bit rate so that it doesn't go over a certain rate?

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• User prompts (MessageBox) with MVVM

  - by mukapu

  The problem statement: I am tired of thinking how to show a simple message box or user prompt and act based on the response in Model-View-View-Model (MVVM). Common approaches: - It's ok, let's just do this one thing from ViewModel and mock this out for unit testing - Design my own dialog, then what to do from there - Can I write something in view code behind, ah yes, that seems to be the only way out, as anyway MVVM is still not matured...  - and what not?   I am pretty much one among the few frustrated out in this world looking for some convincing answers. I think we can do it a little neater without having the feeling of violating any of our self defined rules! Solution: The Control - Implement a simple control with no designer visibility. - Allow a property to be bound to tell when to show the MessageBox - Provide command binding for possible user actions, Yes, No, Cancel... How do I Use? - Just place the necessary XAML tags in the view - Implement the command for all user actions in the View Model - Run unit tests on the commands

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• xrander problem with 1900x1080p

  - by Eslam

  i have a problem with xrandr i successfully executed the following : #cvt 1900 1080 #xrandr 1900x1080 170.75 1904 2024 2224 2544 1080 1083 1093 1120 -hsync +vsync but unfortunately the following command : #xrandr --addmode VGA-0 1900x1080 returned the following error : X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 153 (RANDR) Minor opcode of failed request: 18 (RRAddOutputMode) Serial number of failed request: 29 Current serial number in output stream: 30 the following command output might help in identifying problem : #glxinfo |grep -i opengl OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce 310M/PCIe/SSE2 OpenGL version string: 3.3.0 NVIDIA 310.14 OpenGL shading language version string: 3.30 NVIDIA via Cg compiler OpenGL extensions: #lspci |grep -i vga 01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 310M] (rev a2) any ideas what's gonna be wrong ?

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• What is the difference between "Redirection" and "Pipe"?

  - by John Threepwood

  This question may sound a bit stupid, but I can not really see the difference between redirection and pipes. Redirection is used to redirect the stdout/stdin/stderr, e.g. ls > log.txt. Pipes are used to give the output of a command as input to another command, e.g. ls | grep file.txt. But why are there two operators for the same thing ? Why not just write ls > grep to pass the output through, isn't this just a kind of redirection also ? What I am missing ?

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• How to fix a gstreamer error

  - by BJsgoodlife

  I upgraded to 14.04 and now gstreamer is not working. What I am trying to accomplish is to hear the audio input on my computer coming from a ham radio. This is the command that I am using: gst-launch pulserc ! pulseink. This is the error message that I am receiving: ERROR: pipeline could not be constructed: no element "pulserc". I am wondering if I should purge gstreamer, or if there is another command that I should put it. Thank you again everyone for all of your help.

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• How can I lock screen on lxde

  - by maniat1k

  Like gnome Control + alt + L In Lxde how can i do that? What I have to intall to do this? thanks --searching for a solution on my own but... ok if I do alt+f2 and type xscreensaver-command -lock that's a small solution. tryed to do an small script but it's not working.. this is what I do vi lock.sh #!/bin/bash xscreensaver-command -lock exit 0 chmod +x lock.sh but this doesnt work.. ideas?

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