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• Windows batch file to delete .svn files and folders

  - by Marco Demaio

  Hi,in order to delete all ".svn" files/folders/subfolders in "myfolder" I use this simple line in a batch file: FOR /R myfolder %%X IN (.svn) DO (RD /S /Q "%%X") This works, but if there are no ".svn" files/folders the batch file shows a warning saying: "The system cannot find the file specified." This warning is very noisy so I was wondering how to make it understand that if it doesn't find any ".svn" files/folders he must skip the RD command. Usually using wild cards would suffice, but in this case I don't know how to use them, because I don't want to delete files/folders with .svn extension, but I want to delete the files/folders named exactly ".svn", so if I do this: FOR /R myfolder %%X IN (*.svn) DO (RD /S /Q "%%X") it would NOT delete files/folders named extaclty ".svn" anymore. I tried also this: FOR /R myfolder %%X IN (.sv*) DO (RD /S /Q "%%X") but it doesn't work either, he deletes nothing. Thanks for any help!

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• WinDbg fails to find symbol file reporting 'unrecognized OMF sig'

  - by sean e

  I have received a 64bit dump of a 32bit app that was running on Win7 x64. I am able to load it in WinDbg (hint: !wow64exts.sw) running on a 64bit OS. The symbols for most of my dlls are loaded properly. The pdb for one though does not load. The same pdb does load properly for the same dll when reading a 32bit dump on a different system. I've also confirmed that the dll and pdb match each other via the chkmatch utility. I tried .symopt +40 but the pdb still didn't load. I did !sym noisy then .reload - WinDbg reported: DBGHELP: unrecognized OMF sig: 811f1121 *** ERROR: Symbol file could not be found. Defaulted to export symbols Any ideas on what to try to get WinDbg to load my pdb when reading a 64bit dump?

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• Relationship between .NET ClassLoader and Assembly

  - by smwikipedia

  I am wondering about the relationship between .NET ClassLoader and Assembly I use the "!dumpdomain xxxx" command and got the following output: Domain 1: 00522108 LowFrequencyHeap: 0052212c HighFrequencyHeap: 00522178 StubHeap: 005221c4 Stage: OPEN SecurityDescriptor: 00523430 Name: BoxUnbox.exe **Assembly**: 0056eb88 [C:\Windows\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll] **ClassLoader**: 0056ec08 SecurityDescriptor: 0056c078 Module Name 56d71000 C:\Windows\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll **Assembly**: 005794f0 [] **ClassLoader**: 00579570 SecurityDescriptor: 0057a018 Module Name 00152c5c I noticed that the "ClassLoader" and "Assembly" appear in pair. It seems each Assembly is accompanied with its own "ClassLoader". Why like this? Is this a litte noisy? Why not just assign one "ClassLoader" to a AppDomain and use it to load all the used Assembly into the AppDomain? Isnt't this design more elegant? Many thanks.

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• WinDbg can't find mfc90 version 9.0.30729.4148 symbols on msdl.microsoft.com

  - by Simon Hofverberg

  I think the title states my problem fairly well. Where are those mfc symbols? Some background info: I have a crash dump that I want to analyze in WinDbg. My symbol path contains msdl.microsoft.com/download/symbols (and it says h t t p first but I'm a new user here so I'm not allowed to write that twice. The 9.0.30729.4148 version seems to be installed by some Windows update When a dump contains an earlier version of mfc90, it is located by WinDbg on the Microsoft symbol server with the same settings. When I use !sym noisy, the output for mfc90.dll contains: SYMSRV: http://msdl.microsoft.com/download/symbols/mfc90.dll/4A596D4939c000/mfc90.dll not found The same thing happens on two different computers Edit: See my comments below. The symbols are present on the server, but WinDbg can't get them.

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• Are evolutionary algorithms and neural networks used in the same problem domains?

  - by Joe Holloway

  I am trying to get a feel for the difference between the various classes of machine-learning algorithms. I understand that the implementations of evolutionary algorithms are quite different from the implementations of neural networks. However, they both seem to be geared at determining a correlation between inputs and outputs from a potentially noisy set of training/historical data. From a qualitative perspective, are there problem domains that are better targets for neural networks as opposed to evolutionary algorithms? I've skimmed some articles that suggest using them in a complementary fashion. Is there a decent example of a use case for that? Thanks

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• read subprocess stdout line by line

  - by Caspin

  My python script uses subprocess to call a linux utility that is very noisy. I want to store all of the output to a log file, but only show some of it to the user. I thought the following would work, but the output does show up in my application until the utility has produced a significant amount of output. #fake_utility.py, just generates lots of output over time import time i = 0 while True: print hex(i)*512 i += 1 time.sleep(0.5) #filters output import subprocess proc = subprocess.Popen(['python','fake_utility.py'],stdout.subprocess.PIPE) for line in proc.stdout: #the real code does filtering here print "test:", line.rstrip() The behavior I really want is for the filter script to print each line as it is received from the subprocess. Sorta like what tee does but with python code. What am I missing? Is this even possible?

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• No drop packets using the error models for wirelesss scenario ?

  I am trying to use the error model in ns2 with wireless links, I am using ns2.33. I tried the uniform error model and the markov chain model. No errors from ns but when I am trying to find the dropped packets due to corruption I can not find any of them using either the uniform or markov models. So please help me if I made any error in using the error model. to search for dropped packets I am using eid@eid-laptop:~/code/ns2/noisy$ cat mixed.tr | grep d My code is available here : http://pastebin.com/f68749435

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• Error safe/correcting resource identifier

  - by Martin

  The receiver is my website, the sender is the same but the medium is noisy, a user. He will read an alphanumeric code of length 6 and later input the same code to identify a resource. A good use for a error correcting code, I thought, and rather than do the research I thought I'd just put the question out there. Or I might be going about it the wrong way, since the situation is rather like sending a perfect dictionary along with every transmission. The requirements on the code are simply: 6 alphanumeric digits, to start with until I run out, anyway. If the user gets it wrong I should still be able to identify the right resource. No resource is preferable to the wrong one. Easy to code or have free libraries for .net Any suggestions?

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• "Voice trigger" detection

  - by sehugg

  I have a voice application that would be much-improved if there was the ability to use a "trigger word" to start recording audio. I don't need a full speech-text engine, just the ability to reliably/efficiently detect the trigger word. I am wondering if there are any specialized speech engines that support this specific use case, or any libraries/methods to developing such a single-purpose detection engine. Ideally I'd like it to work in noisy environments, but it can be trained for a single user's voice. Pointers to research papers / topics would also be appreciated so I know what to ask for.

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• Information Modeling

  - by Betamoo

  The sensor module in my project consists of a rotating camera, that collects noisy information about moving objects in the surrounding environment. The information consists of distance, angle and relative change of the moving objects.. The limiting view range of the camera makes it essential to rotate the camera periodically to update environment information... I was looking for algorithms / ways to model these information, in order to be able to guess / predict / learn motion properties of these object.. My current proposed idea is to store last n snapshots of each object in a queue. I take weighted average of positions and velocities of moving object, but I think it is a poor method... Can you state some titles that suit this case? Thanks

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• Background subtracting in MATLAB

  - by eiphyomin

  I'm looking to do background subtracting on an image. I'm new to MATLAB and new to image processing/analysis, so sorry if any of this sounds stupid. 1) Other than imsubtract() are there other ways to do background subtracting (besides comparing one image to another)? 2) In the Math Works explanation for imsubtract() why do they make their structuring element a disk? This seems rather difficult so far because every time I try something, I end up not only subtracting the noisy background but also losing the parts of the image I want to look at!

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• Dealbreakers for new programming jobs?

  - by Echostorm

  What might be said or implied at an interview or job posting that should set off alarm bells for a coder? I'm still only a few years in the industry but I already know to look out for excessive red tape and bureaucracy. Cubes and a noisy office also tell me that I'll be both miserable and unproductive and that management does not appreciate what coders need to work well. Edit: The way things are going I'm taking extra time to look at the company's stability. If they depend on a single vendor for their livelihood and could be out of business if the vendor decides they don't really need the service or can do it in-house. What are your dealbreakers?

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• Graphics card fan is loud (additional graphics card drivers cause problems)

  - by tk4muffin

  Okay this explanation is a bit longer ... but I start at the beginning: I've been using Windows 7 for a very long time, shortly after the release of v12.10 I installed Ubuntu via Windows installer. Everything worked fine but the fan of the graphics card. After a bit of research I found out, that I just had to select a different driver (nvidia-current (proprietary, tested) worked pretty well). This also fixed some graphical bugs when I just logged into my account. Due to my university I got a MSDNAA-Account (allows me to download every Windows OS for free). I downloaded and installed Windows 8. After configuration I installed ubuntu via the Windows installer once again and the first couple launches of ubuntu went well. Suddenly ubuntu didn't launched anymore...caused by some hard-disk errors and had no clue what to do. So I kept working on Windows 8 - unfortunately. After playing around with the new Windows, I put my PC to sleep-mode. I couldn't wake my PC up and it wasn't responding to anything (neither mouse-movement, -clicks or keyboard strokes, nor the power-button and the reset-button worked), so I pulled the plug. Turns out, this was a huge mistake. Somehow the BIOS broke and after restarting a couple of times, the BIOS repaired itself. Neither Windows 8, nor ubuntu where bootable. Now I had to install ubuntu several times, because after rebooting unity was hidden and I didn't know what the problem was and how to fix it. I finally realized that this problem was caused by the graphics card driver, which I've changed to the nvidia-current (This dirver worked fine before my PC "crashed"). So I installed Windows 8 again and after a bit of usage I installed ubuntu once again (via DVD). The booting of ubuntu and windows works fine - so far. But I'm still not able to change the graphics card driver without unity hiding away after restarting the OS. The noisy fan is really disturbing my work... PC Specs: Processor: Intel Core 2 Duo COU E8400 @ 3GHz x2 Memory: 7.8 GB OS type: 64-bit Graphics Card: GeForce 9600 GT Motherboard: Asus P5Q I hope the information given are enough.

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• How to refactor a Python “god class”?

  - by Zearin

  Problem I’m working on a Python project whose main class is a bit “God Object”. There are so friggin’ many attributes and methods! I want to refactor the class. So Far… For the first step, I want to do something relatively simple; but when I tried the most straightforward approach, it broke some tests and existing examples. Basically, the class has a loooong list of attributes—but I can clearly look over them and think, “These 5 attributes are related…These 8 are also related…and then there’s the rest.” getattr I basically just wanted to group the related attributes into a dict-like helper class. I had a feeling __getattr__ would be ideal for the job. So I moved the attributes to a separate class, and, sure enough, __getattr__ worked its magic perfectly well… At first. But then I tried running one of the examples. The example subclass tries to set one of these attributes directly (at the class level). But since the attribute was no longer “physically located” in the parent class, I got an error saying that the attribute did not exist. @property I then read up about the @property decorator. But then I also read that it creates problems for subclasses that want to do self.x = blah when x is a property of the parent class. Desired Have all client code continue to work using self.whatever, even if the parent’s whatever property is not “physically located” in the class (or instance) itself. Group related attributes into dict-like containers. Reduce the extreme noisiness of the code in the main class. For example, I don’t simply want to change this: larry = 2 curly = 'abcd' moe = self.doh() Into this: larry = something_else('larry') curly = something_else('curly') moe = yet_another_thing.moe() …because that’s still noisy. Although that successfully makes a simply attribute into something that can manage the data, the original had 3 variables and the tweaked version still has 3 variables. However, I would be fine with something like this: stooges = Stooges() And if a lookup for self.larry fails, something would check stooges and see if larry is there. (But it must also work if a subclass tries to do larry = 'blah' at the class level.) Summary Want to replace related groups of attributes in a parent class with a single attribute that stores all the data elsewhere Want to work with existing client code that uses (e.g.) larry = 'blah' at the class level Want to continue to allow subclasses to extend, override, and modify these refactored attributes without knowing anything has changed Is this possible? Or am I barking up the wrong tree?

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• GPU hung when switching graphic card

  - by Lie Ryan

  I have a laptop (Dell Inspiron N4110) with a switchable graphic. $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: ATI Technologies Inc NI Whistler [AMD Radeon HD 6600M Series] (rev ff) Normally, my laptop starts with both graphic cards enabled, which caused the laptop to turn very hot and the fan to become very noisy. I have been using a small script to disable the Radeon card. For some time, I'm quite happy with this arrangement. However, I have been having some issues with the Intel card (IGD), the Intel card often randomly hang when running OpenGL apps; and so I want to give the Radeon card (DIS) another chance. I have never been able to switch to the Radeon card, but recently, I found out that if I do a "delayed switching" (DDIS): # echo "DDIS" > /sys/kernel/debug/vgaswitcheroo/switch root@lieryan-dell-ubuntu:/sys/kernel/debug/vgaswitcheroo# cat switch 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Pwr:0000:01:00.0 then I logoff (i.e. to restart X), the screen switch to pseudo-tty and then it stuck there freezing. At this situation, mouse and keyboard stops working so I can't switch to another ptty. I tried ssh-ing from another computer to salvage logs (dmesg at that point) and whatnot; I found out that when freezing, the active graphic card is the AMD card: -- this is from ssh -- # cat switch 0:IGD: :Off:0000:00:02.0 1:DIS:+:Pwr:0000:01:00.0 but the GPU is apparently hung, looking at dmesg gives: ... [ 1411.649974] vga_switcheroo: client 0 refused switch [ 1411.649985] vga_switcheroo: setting delayed switch to client 1 [ 1423.911759] vga_switcheroo: processing delayed switch to 1 [ 1424.006564] fbcon: Remapping primary device, fb1, to tty 1-63 [ 1424.006799] i915: switched off [ 1424.840351] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1425.718088] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1426.622377] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1427.355683] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1428.193549] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id ... the invalid framebuffer id error is repeated for many times over ... I were able to successfully recover by switching back to the Intel card and restarting X from ssh; indicating that only the Radeon card has problems switching. System info: $ uname -a Linux lieryan-dell-ubuntu 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21 20:28:43 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 11.10 Release: 11.10 Codename: oneiric The laptop also do not have the option to set graphic card at BIOS and the proprietary driver, fglrx, also have never worked; when I installed it through jockey ("Additional Drivers"), glxinfo showed that it still being rendered by Mesa, the /sys/kernel/debug/vgaswitcheroo directory has gone missing, and the driver crashes with a traceback if I use xorg.conf to tell X to use fglrx. Anyone had any idea if it is possible to use this AMD card either with the radeon or the fglrx driver? logs: dmesg

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• changing drive nodes & hdparm

  - by Kalamalka Kid

  I am currently attempting to create a command that works at startup to kill the power on two of my very noisy hard drives. I have edited the etc/rc.local file to include this command: sudo hdparm -y /dev/sdc sudo hdparm -y /dev/sdd exit 0 While I think this should work, it seems the allocated drives keep switching around every time I reboot. I have sda, sdb, sdc, sdd, and sde but they keep getting jumbled around (making the drive I wish to shut different than sdd which is making the task of shutting down the right drive on start-up quite cumbersome. I had a perfectly functioning ftstab file working which disappeard, but I restored it from the back up into the etc/ dir: # <file system> <mount point> <type> <options> <dump> <pass> #Entry for /dev/sda1 : UUID=43c09daf-08a5-44f2-89b0-fc7c6f0d1e67 / ext4 errors=remount-ro 0 1 #Entry for /dev/sdd1 : UUID=443AFBAD7FE50945 /media/DX100 ntfs-3g defaults,nosuid,nodev,locale=en_CA.UTF-8 0 0 #Entry for /dev/sdb1 : UUID=FCE456F5E456B21E /media/GalaxyM83 ntfs-3g defaults,nosuid,nodev,locale=en_CA.UTF-8 0 0 #Entry for /dev/sdf1 : UUID=1CA057FDA057DBB8 /media/Holideck ntfs-3g defaults,nosuid,nodev,locale=en_CA.UTF-8 0 0 #Entry for /dev/sdc1 : UUID=7ABB49654B799D40 /media/JX3P ntfs defaults,nosuid,nodev,locale=en_CA.UTF-8 0 0 it seems every time I boot the order of the drives changes. I do not know how to resolve this. A quick workaround the problem was to go with UUID instead of the DEV letter by editing the etc/rc.local file to include: hdparm -y /dev/disk/by-uuid/443AFBAD7FE50945 hdparm -y /dev/disk/by-uuid/7ABB49654B799D40 So I thought I was in the clear, as I heard both hard drives die down during the boot sequence, BUT, as soon as I log in both drives start up again! so now I have to figure out what is making them start up again after log in, or perhaps another way to get them to turn off. Is there some kind of command i can get to execute after log in? I tried editing the startup applications to include an autossh with: autoshh - sudo hdparm -y /dev/disk/by-uuid/7ABB49654B799D40 autoshh - sudo hdparm -y /dev/disk/by-uuid/443AFBAD7FE50945 but this did not seem to work to turn off the disks after log in.

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• Summary of our Recent Pull Request Enhancements on CodePlex

  Over the past several weeks, we’ve been incrementally rolling out a bunch of enhancements around our pull request workflow for Git and Mercurial projects. Our goal is to make contributing to open source projects a simple and rewarding experience, and we’ll continue to invest in this area. Here’s a summary of the changes so far, in case you’ve missed them. As always, if you have any feedback, please let us know, whether on our ideas page or via Twitter. Support for branches You can now pick the source and destination branches for your pull request, whether you’re sending one from your fork, or using it within a project to collaborate with your other trusted contributors. A redesigned creation experience Our old pull request creation form was rather lacking. It asked for a title and comment in a small modal dialog, but that was about it. We knew we could do better, so we rethought the experience. Now, when you create a pull request, you’re taken to a new page that let’s you select the source and destination, and gives you information on the diffs and commits that you’re sending, so you can confirm that you’re sending the right set of changes. Inline code snippets in discussion If users comment on code in your pull request, we now display a preview of the snippet of relevant code inline with their comment on the discussion. Subsequent replies on that line are combined in a single thread to preserve your context. No more clicking and hunting to find where the comments are. And you can add another inline comment right from the discussion area. Comment notifications You can now elect receive an e-mail notification if a user comments on your pull request. If it’s on a line of code, we’ll display the relevant code snippet in the e-mail. Redesigned diff viewer Our old diff viewer hadn’t been touched in a while, and was in need of an update. We started with a visual facelift to use standard red/green colors for additions/deletions and remove the noisy “dots” that represented spaces and that littered the diff viewer. Based on feedback that the viewable region for diffs was too small, especially for smaller screen resolutions, we revamped the way the viewport for the code is sized, and now expand it to fill the majority of the browser height when scrolling down. The set of improvements we implemented here also apply anywhere diffs are viewed, not just for pull requests.

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• Windows 7 intermittently drops wired internet/lan connection.

  - by CraigTP

  In a nutshell, my Windows 7 Ultimate PC intermittently drops it's internet connection. Why? Background: My PC is wired to my ADSL modem/router which is directly connected to the phone line. I also have wireless connectivity turned on within the router for a laptop to connect wirelessly. Every few hours or so, when using my PC, I find I cannot access the internet and pages will not load. Eventually, Windows7 will update the network icon in the task-tray to show the exclamation mark symbol on the network icon. Opening up the Network And Sharing Centre will show the red cross between the "Multiple Networks" and "The Internet". Here's a picture of the "Network And Sharing Centre" (grabbed when everything was working!) As you can see, I'm running Sun's VirtualBox on this machine and that creates a Network connection for itself. This doesn't seem to affect the intermittent dropping (i.e. the intermittent drops occur whether the VirtualBox connection is in use or not). When the connection does drop, I cannot access any internet pages, nor can I access the router's web admin page at http://192.168.1.1/, so I'm assuming I've lost all local LAN access too. It's definitely not the router (or the internet connection itself) as my laptop, using the wireless connection (and running Vista Home Premium) continues to be able to access the internet (and the router's web admin pages) just fine. Every time this happens, I can immediately restore all internet and LAN access by opening Network Adapter page, disabling the "Local Area Connection" and then re-enabling it. Give it a few seconds and everything is fine again. I assume this is because, beneath the GUI, it's effectively doing an "ipconfig /release" then "ipconfig /renew". Why does this happen in the first place, though? I've googled for this and seen quite a few other people (even on MSDN/Technet forums) experiencing the same or almost the same problem, but with no clear resolution. Suggestions of turning off IPv6 on the LAN adapter, and ensuring there's no power management "sleeping" the network adapter have been tried but do not cure the problem. There does not seem to be any particular sequence of events that cause it to happen either. I've had it go twice in 20 minutes when just randomly browsing the web with no other traffic, and I've also had it go once then not go again for 2-3 hours with the same sort of usage. Can anyone tell me why this is happening and how to make it stop? EDIT: Additional information based upon the answer provided so far: Firstly, I forgot the mention that this is Windows 7 64 bit if that makes any difference at all. I mentioned that I don't think the VirtualBox network adpater is causing this problem in any way, and I also have VirtualBox installed on two other machines, one running Vista Home Premium and the other running XP. Neither of these machine experience the same network connectivity issues as the Windows 7 machine. The IP assignment for the Windows 7 machine is the same both before and after the "drop". I have a DHCP server on the router issuing IP Addresses, however my Windows 7 machine uses a static address. Here's the output from "ipconfig": Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 192.168.1.2(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 192.168.1.1 NetBIOS over Tcpip. . . . . . . . : Enabled Within the system's event logs, the only event that relates to the connection dropping is a "DNS Client Event" and this is generated after the connection has dropped and is an event detailing that DNS information can't be found for whatever website I may be trying to access, just as the connection drops: Log Name: System Source: Microsoft-Windows-DNS-Client Event ID: 1014 Task Category: None Level: Warning Keywords: User: NETWORK SERVICE Description: Name resolution for the name weather.service.msn.com timed out after none of the configured DNS servers responded. The network adapter chipset is Realtek PCIe GBE Family Controller and I have confirmed that this is the correct chipset for the motherboard (Asus M4A77TD PRO), and in fact, Windows Update installed an updated driver for this on 12/Jan/2009. The details of the update say that it's a Realtek software update from December 2009. Incidentally, I was still having the same intermittent problems prior to this update. It seems to have made no difference at all. EDIT 2 (1 Feb 2010): In my quest to solve this problem, I have discovered some more interesting information. On another forum, someone suggested that I should try running Windows in "Safe Mode With Networking" and see if the problem continues to occur. This was a fantastic suggestion and I don't know why I didn't think of it sooner myself. So, I proceeded to run in Safe Mode with Networking for a number of hours, and amazingly, the "drops" didn't occur once. It was a positive discovery, however, due to the intermittent nature of the original problem, I wasn't completely convinced that the problem was cured. One thing I did note is that the fan on my GFX card was running alot louder than normal. This is due to the fact that I have an ASUS ENGTS250 graphics card (http://www.asus.com/product.aspx?P_ID=B6imcoax3MRY42f3) which had a known problem with a noisy fan until a BIOS update fixed the issue. (See the "Manufacturer Response" here: http://www.newegg.com/Product/Product.aspx?Item=N82E16814121334 for details). Well, running in safe mode had the fan running (incorrectly) at full speed (as it did before the BIOS update), but with an (apparently) stable network connection. Obviously some driver was not loaded for the GFX card when in Safe Mode so this got me thinking about the GFX card (since the very noisy fan was quite obvious when running in Safe Mode). I rebooted into normal mode, and found that Nvidia had a very up-to-date new driver for my GFX card (only about 1 week old), so I downloaded the appropriate driver and installed it. After installation and a reboot, I was able to use my PC for an entire day with NO NETWORK DROPS!!! This was on Saturday. However, on the Sunday, I also had my PC for pretty much the entire day and experienced 2 network drops. No other changes have been made to my PC in this time. So, the story seems to be that updating my graphics card drivers seems to have improved (if not completely fixed) the issue, however, I'm still searching for a proper fix for this problem. Hopefully, this information may help anyone who may have additional ideas as to why this problem is occuring in the first place. (And why does new GFX card drivers have anything to do with the network?) I appreciate everyone's feedback so far. However, I'll have to ask once more if anyone has any further ideas of how to fix this particular problem? Thanks in advance.

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• Audio Static/Interference regardless of audio interface?

  - by Tom

  I currently am running a media center/server on a Lubuntu machine. The machine specs: Core 2 Duo Extreme EVGA SLI 680i MotherBoard 2 GB DDR2 Ram 3 Hard Drives no raid - WD Caviar Black, Green, and Samsung Spinpoint Galaxy GTX 220 1GB External USB Creative XI-FI Extreme Card 550W Power Supply This machine is hooked up through an optical cable to an ONKYO HTR340 Receiver through the XIFI card. Whenever I play any audio regardless if it is through XBMC, the default audio player, a flash video, etc, I get a horrible static sound that randomly gets louder. Here is a video of the sound: http://www.youtube.com/watch?v=SqKQkxYRVA4 This static comes in randomly, sometimes going away for short periods, but eventually always comes back. So far I have tried everything I could think of: Reinstalling OS Installing/upgrading/repairing PulseAudio/Alsa Installing alternate OSes, straight Ubuntu, Lubuntu, Xubuntu, Arch, Mint, Windows 7 Switching audio from the external card to internal Optical, audio out through HDMI, audio out through headphones Different ports on receiver (my main desktop sounds fine on the same sound system) Different optical cables Unplugging everything unnecessary from the motherboard (1 HD, 1 Stick of Ram, 1 Keyboard) Swapping out ram Swapping out the motherboard Replacing the Graphics Card (was replaced due to fan being noisy, not specifically for this problem) Different harddrives Swapping power supply Disabling onboard audio Pretty much everything short of swapping the CPU. I haven't been able to narrow down the problem and it is getting frustrating. Is it possible that the CPU is faulty and might cause a problem such as this, or that the PC case is shorting out the motherboard? Any kind of suggestions will be appreciated.

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• What is the best keyboard for typing speed (not layouts)

  - by Gapton

  So I am a programmer, and I like playing typing speed games. My typing speed is, for common English words, 85 to 90 wpm, max 95. I type on various devices, my laptop, desktop, office pc.... they all have slightly different keyboards. Being a curious programmer, I wonder what types of keyboard is used for the highest possible typing speed. Or let me phrase it in another way, what is the type of keyboards that people use in typing speed contest? Here is something I know that I feel like I can share: It must be a wired keyboard, I can feel the lag as I am typing this on my wireless keyboard, even if it is a slightly more expensive model which claims to have zero lag. I know people prefer a mechanical keyboard, for the hepatic feedback, however I have not tried one. It lasts longer and is noisy, it also does not have the problem of normal keyboards where you press many keys at a time the signals will get all jammed and the computer will only receive one or two keys. I personally prefer those "thin profile" keyboards. I type a lot, and 95 wpm put me in the top 5%, this is of course just on a gaming site. However when I type on the fat keyboards, my fingers have to travel a much longer distance before the keys actually click. This is where I find myself typing much faster with those thin profile keyboards found on my laptop. Because my fingers only hover on the keys and I only need to press a short distance, each stroke takes less force and light rapid strokes is what makes me type fast. When I type on a fat keyboard, I was forced to use heavy strokes, and this slows me down. There must be some people out there who are keyboard scientists, who actually do experiments and user tests with different setups. It would be interesting to understand more about the things we use everyday for not just work but a majority of our communications. P.S. this is about hardware and not about switching keyboard layouts to dvorak

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• Broken Creative DTT3500 Digital

  - by djechelon

  Hello, many years ago I bought a Creative DTT3500 Digital surround speakers system. It's been a while since my home theatre started behaving strange. During the past 6 months, I have noticed that the amplifier needed some time before correctly playing digital audio. Until a couple of weeks ago, it needed up to 5 minutes of very noisy "warm up" before playing an "almost" clear audio. Today, I found that even using the analog input (completely disabling digital inputs) the noise persists. Powering off and on the speakers doesn't work. Now, it's reasonable that after almost 10 years, the amplifier got broken. My problem is that I can't simply replace the speakers with another kit from another brand, since 2 speakers in my room are placed in the back wall, with coaxial cables going under the floor but not completely inside a single tube. I mean, I have coaxial extension cables starting from the DTT3500 amplifier, going into the wall, then under the floor in a plastic cable tube, then exiting the tube (still under the floor), connecting to the male coaxial connector of the original cable supplied by Creative, and continuing up to the point close to my bed where the speakers are. I could replace the speakers **only as soon as the new speakers have the same coaxial to bi-polar cables that Creative ships with DTT3500 Another option might be "repairing the amplifier", but I don't know if it's feasible, what should I or a technician look for in the amplifier, and how much would it cost (is it worth to repair or buy a new kit considering the problem above? What do you suggest me to do, basing on the above observation? Thank you.

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• Raid-1 Western Digital Green AARS, cloning and WD Align Utility

  - by Jaguar

  Hello all, My current setup runs on top of 2x Western Digital 2500KS drives on Raid-1, using the motherboard's 780G raid controller, on WinXP. Everything is fine, but the drives are a bit noisy. I am considering buying 2x WD6400AARS disks which are the 640GB slower 'green' drives, but also feature the Advanced Formatting 4KB sectors. This means that for WinXP the partition will have to be aligned to work properly, else there is a performance penalty. There are 2 questions here: The Green drives from WD are all slower and are (according to WD) susceptible to drop-out's from the controller. Has anyone any experience in this matter? Is there a possibility the controller will drop a drive? If so, can i do anything about it? Secondly, western digital gives a utility to perform the alignment on the partition. The thing is, will the utility see the drives in question as the operating system only sees 1 logical disk? I will be making the transition using a cloning tool (most probably norton ghost) unless i don't find a solution or a clear answer, in which case i'll just buy a win 7 license and make a clean install... thx in advance

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• Backup, Migrate or Clone Failing CentOS 4 (LVM)

  - by Hegelworm

  Hello there, I've been running a BlueQuartz CentOS 4 system (Nuonce.net distro) for a few years now and although the hard drive (Deskstar) has always been a bit noisy, on a few recent occasions I've heard it having trouble spinning up. Basically, I want to clone this drive to a similar sized one (80 Gig). I've spent many hours reading upon dd, dd_rescue, rsync, clonezilla and LVM mirroring yet the sheer number of options and nightmarish accounts has left me frozen - unable to make an informed decision as to how to start. I've made a few attempts. dd failed after about 2 hours, as, although the drives appeared to be identical on the surface (ATA Seagate Barracudas, Thai not Chinese), the destination drive is slightly smaller. My most recent attempt involved using a Debian CD to format the new drive and then rsync-ing everything over and editing the new drive's grub and fstab to reflect the changes. No joy here either as I hadn't chosen LVM when partitioning the destination drive and it wouldn't boot. As you can probably tell, I'm out of my depth here and a panic-invoking mixture of caution and frustration has prompted me to sign up here. The server itself, although not strictly a production environment, has a very specific installation of Festival, LAME and ffMpeg and provides the back-end for a Text-to-Speech jQuery plugin that I've built over the last 2 years. I'm also planning to rebuild the whole TTS system on Debian as the existing CentOS system still has PHP4 etc. For now though, I'd really like to just shift everything over to a new drive. As this is my first post, please feel free to lay any house rules on me that I might've overlooked; I've been hovering around StackOverflow for a while now but have only just signed up. Many thanks.

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• Joining two routers together, but I have no access to the second router, although I know it's IP address and Gateway

  - by JohnnyVegas

  I have temporarily moved into a rented apartment for 4 months, which has wireless. The trouble I am having is that the access points here are wifi only and no RJ45 and I need to use RJ45 to connect some equipment that I am working with. I have purchased an RT-N66U and installed Tomato (shibby ver. 1.28) and successfully replaced the existing access point, but now I want to enable the access point that I have replaced as it links wirelessly to 3 others. Can I plug in a cable from the access point to my RT-N66U and get it to access the internet via my router? I have no access to the existing wireless access point, and don't want to reset it as it's not mine. There is another router situated in the roof somewhere which I also have no access to, but it's supplying my RT-N66U internet and I most definitely have a double-nat, which although isn't the best way of doing things I am limited with what I can do. Any suggestions on routing tables, vlans etc would be helpful, but I have no experience in these fields before - but I know the tomato firmware can cater for this. My router is set to IP 10.0.1.1 and dhcp is 10.0.1.100-200 The wireless access point address was 192.168.1.2 but this was assigned by the router in the roof which has the address 192.168.1.1. There is a cable from this router going to a wall socket which I now have my RT-N66u attached to via the WAN port. I understand it's scruffy and it isn't the way to do things but I have tried to ask for the admin details but as the wireless network is looked after by a third party and nobody knows their details I am stuck with this dilemma. I could buy three wireless access points and replace the existing but this isn't what I want to do, and although I have installed plenty of DD-WRT wireless repeater bridges they simply don't work here for some unknown reason. The phone line here is very noisy too and I don't have the rights to install ADSL in a building that isn't mine, and 3G coverage isn't good enough either. Thanks for your time

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• Bridged network on OS X only gets UDP broadcast traffic

  - by a paid nerd

  I've created a bridged network Mac OS X 10.8.5 using ifconfig and TUNTAP for OS X to bridge my wireless connection, en0, with a virtual interface, tap0, which I can use for guest VMs: $ sudo sysctl -w net.inet.ip.forwarding=1 $ sudo sysctl -w net.link.ether.inet.proxyall=1 $ sudo sysctl -w net.inet.ip.fw.enable=1 $ sudo ifconfig bridge0 create $ sudo ifconfig bridge0 addm en0 addm tap0 $ sudo ifconfig bridge0 up $ ifconfig en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 28:cf:xx:xx:xx:xx inet6 xxxx::xxxx:xxxx:xxxx:xxxx%en0 prefixlen 64 scopeid 0x4 inet 192.168.100.64 netmask 0xffffff00 broadcast 192.168.100.1 media: autoselect status: active bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether ac:de:xx:xx:xx:xx Configuration: priority 0 hellotime 0 fwddelay 0 maxage 0 ipfilter disabled flags 0x2 member: en0 flags=3<LEARNING,DISCOVER> port 4 priority 0 path cost 0 member: tap0 flags=3<LEARNING,DISCOVER> port 8 priority 0 path cost 0 tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 ether ca:3d:xx:xx:xx:xx open (pid 88244) However, if I tcpdump -i tap0, I only see broadcast traffic. Shouldn't I see a mirror of everything on en0? (192.168.100.33, the host doing the broadcasting, is another unrelate, noisy server on my LAN.) (I asked a similar question here and will probably close it.)

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