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• Skype webcam not working in 12.04

  - by To Do

  I have a logitech quickcam messenger that was working fine until I upgraded to Ubuntu 12.04. I had to use preload v4l hack but since then it always worked for three consecutive ubuntu versions. Now, when I start the webcam during a call, it works for a few seconds, then it freezes, sortof resets and starts updating the image every 5 seconds, like a slide show. If I go to options and test the video it works fine. The webcam works fine as well with google talk. Does anybody have the same problem?

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• Simple Math Multiplayer game - is Ajax sufficient?

  - by Christian Strang

  I'm planning to create a simple math multiplayer game and I plan to just use Ajax for the server/client communication but I'm not sure if this is sufficient or if I need a socket server. The game will look like this: 2-4 users all get a simple math task (like: "37 + 14") they have to solve it as fast as possible first user who solves it is the winner I will track the time for each user, since the game started, on the client side and everytime a user gives an answer, the answer and the passed time will be send to the server. Additionally I'll add a function which will check every 3 seconds if the other users finished, how much time they needed and who won. Do you think this is possible just using Ajax? What alternatives are there?

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• How to restore GRUB without re-installing the OS?

  - by Calixte

  A friend of mine has a Packard Bell laptop that came with Windows pre-installed. I installed Ubuntu on it and it works fine, but everytime she tried to boot Windows on it (fortunately rarely) it fails and the computer is unable to boot any OS anymore. Upon boot, the computer stops on a black screen with a GRUB Rescue prompt. Is there any way to restore GRUB without re-installing Ubuntu? (preferably an easy way as I cannot do it for her and she is not extremely computer literate) Also (but less important), is there a way to configure GRUB (or something else) so that Windows won't destroy it on every boot attempt?

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• What's an easy way to remember what the term 'memoization' means

  - by Evan Plaice

  I know this sounds like a strange question. Intuitively, I know what the concept of memoization means because I have used it in my code before I ever heard of the term. The problem is, I use it so rarely that I lose the association and have to look it up; and, it feels like technobabble (read. gibberish) every time I use it. I might as well be a 'turboenacabulator'. Is there an easy/simple way to describe how memoization works that relates to the word itself.

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• 12.10: How to hide bind mounts in nautilus?

  - by Bazon

  Summary: How do I remove folders mounted via bind or bindfs in /etc/fstab from appearing as devices in nautilus left column, the "places" view? detailed: Hello, I mount various directories from my data partition via bind in /etc/fstab in my home directory, eg like this: #using bind: /mnt/sda5/bazon/Musik /home/Bazon/Musik none bind,user 0 0 #or using bindfs bindfs#/mnt/sda5/tobi/Downloads /home/tobi/Downloads fuse user 0 0 (Background: /dev/sda5 mounted to /mnt/sda5 is my old home partition, but I do not want to mount it as a home partition, as I always have at least 2 Linuxes on the computer ...) That works well, but since 12.10 every one of those items is listed in Nautilus in the left column under "Devices". (Where normally USB drives appear, etc.) This is a waste of space (as I have many of such mounts...) and so I would like to have these mounts hidden, just as it was before in 12.04. How can I do that? Thanks!

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• Managing multiple references of the same game entity in different places using IDs

  - by vargonian

  I've seen great questions on similar topics, but none that addressed this particular method: Given that I have multiple collections of game entities in my [XNA Game Studio] game, with many entities belonging to multiple lists, I'm considering ways I could keep track of whenever an entity is destroyed and remove it from the lists it belongs to. A lot of potential methods seem sloppy/convoluted, but I'm reminded of a way I've seen before in which, instead of having multiple collections of game entities, you have collections of game entity IDs instead. These IDs map to game entities via a central "database" (perhaps just a hash table). So, whenever any bit of code wants to access a game entity's members, it first checks to see if it's even in the database still. If not, it can react accordingly. Is this a sound approach? It seems that it would eliminate many of the risks/hassles of storing multiple lists, with the tradeoff being the cost of the lookup every time you want to access an object.

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• How to prevent my screen from either dimming or the screen-lock starting when watching YouTube?

  - by Steven Roose

  My screen brightness used to dim after a few seconds to preserve battery. This is default in Ubuntu 12.04. However when watching video it should not dim. This works correctly when I watch videos using native applications like VLC. With in-browser video, however, the screen is not prevented from dimming. This is very annoying as you have to move your cursor every 10 seconds or so. I used to use Mac OSX where I had the same dimming settings and Flash videos were taken into account correctly. Anyone an idea how you can make YouTube prevent your screen from dimming?

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• Truly useful UML diagrams

  - by eversor

  UML has a jungle of Diagrams. Profile Diagrams, Class Diagrams, Package Diagrams... However, (IMH-and-not-too-experienced-O) I quite see that doing each and every diagram is overkill. Therefore, which UML Diagrams are more suitable in a web context, more expecificly a blog (we want to build it from scratchs). I understand that just because I used UML Diagrams does not imply that our code would be great and brilliant... but, it certainly would be better than just unplanified code...

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• Bluetooth mouse contstantly failes to reconnect after sleep

  - by Peter NUnn

  It seems the bluetooth subsystem shows some bugs after the upgrade to 13.10. It was working quite happily at 13.04. The bluetooth mouse I have, simply won't connect after the computer goes into any sort of sleep and has to be re-added each and every time. Sometimes the the entire bluetooth stack has vanished alltogether. What changed with the bluetooth between these versions, that may cause this? This is a fresh install of Kubuntu I'm using (bluedevil) no an upgrade, but the same hardware as 13.04 was happy on. I have reported this as a bug https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/124698 and added the link here as requested.

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• write to depth buffer while using multiple render targets

  - by DocSeuss

  Presently my engine is set up to use deferred shading. My pixel shader output struct is as follows: struct GBuffer { float4 Depth : DEPTH0; //depth render target float4 Normal : COLOR0; //normal render target float4 Diffuse : COLOR1; //diffuse render target float4 Specular : COLOR2; //specular render target }; This works fine for flat surfaces, but I'm trying to implement relief mapping which requires me to manually write to the depth buffer to get correct silhouettes. MSDN suggests doing what I'm already doing to output to my depth render target - however, this has no impact on z culling. I think it might be because XNA uses a different depth buffer for every RenderTarget2D. How can I address these depth buffers from the pixel shader?

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• Mount and unmount errors when usb is connected in 12.10.

  - by Mysterio

  I just installed 12.10 and noticed some strange behaviour every time I connect a USB storage device. It reports I already have the device mounted by a different user but there is only one user account on this set up. Here is a picture of the dialogue: Also when I try to mount the inserted USB drive, I have to enter gain root privileges before the device will unmount successfully. Like this: . I can't copy/delete any file without root access either with the default file manager or third party file manager, Marlin. How do I resolve this rather frustrating experience? Thanks in advance.

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• Why are we being twitter spammed?

  - by Tom Gullen

  This is a search relating to us: https://twitter.com/#!/search/realtime/scirra We're getting a of of new accounts tweeting: The Layers Bar - Scirra.com Firstly this is not us doing it as we're quite proud of doing everything completely whitehat. Also this tweet doesn't make any sense, "The Layers Bar" seems to be referring to a manual entry of ours. They all seem to be new accounts with no followers and no prior tweets coming in like clockwork every hour. Does anyone know why this could be happening? Could this harm us? It it possible to find out the source of this? I should mention I'm hesitant to report them all as spam because it could look like we are the culprits.

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• How Often do You Change E-mail Addresses? [Poll]

  - by Asian Angel

  Recently we ran across an article about a man who consistently changes his e-mail address every 20 months. Why? To throw off spam. With that in mind we became curious and decided to ask how often you change your e-mail addresses… Everyone has their own method for dealing with the bane known as spam whether it is heavy filtering, separate accounts to catch possible spam activity, abandoning swamped accounts, etc. Here is your opportunity to share how you deal with spam, protect your accounts, and to voice your thoughts regarding consistent timed changes to new accounts as mentioned in the article linked to below. How-To Geek Polls require Javascript. Please Click Here to View the Poll. How Frequently Do You Change Your Email Address? [Apartment Therapy] 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

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• Blogging & SEO - They Go Hand in Hand

  You write a blog loyally every day or so. You provide informative, fascinating substance for your faithful readers. You've even got a number of member links in there, too. But is that this enough to induce great search engine results for your hard work? In all probability not. Certain, you'll get listed with the search engines effortlessly. But without a high twenty listing at one among the majors (Google, Yahoo! or MSN), you will not have traffic, literally, banging down your door....

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• How to avoid or minimise use of check/conditional statement in my scenario?

  - by Muneeb Nasir

  I have scenario, where I got stream and I need to check for some value. If I got any new value I have to store it in any of data structure. It seems very easy, I can place conditional statement if-else or can use contain method of set/map to check either received is new or not. But the problem is checking will effect my application performance, in stream I will receive hundreds for value in second, if I start checking each and every value I received then for sure it effect performance. Anybody can suggest me any mechanism or algorithm to solve my issue, either by bypassing checks or at least minimize them?

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• 302 Redirect causes garbage at end of Wordpress link in Facebook

  - by Joao

  When I try to link my Wordpress blog to Facebook, the url doesn't resolve properly. There's garbage appended at the end and Facebook is not able to retrieve information from the site. Happens in every page, post or main entry. Here's what happens: http://clarissarezende.com.br/ shows up in Facebook as http://clarissarezende.com.br/UPLcS/ (when copy/paste the link) and no information about the site shows up in FB. I'm using Wordpress 3.3.1 with ProPhoto 4. Recently I moved the DNS entry on my ISP. The blog is hosted at clarissarezende.com.br/public_html/blog2 and before the DNS would point to public_html and then I changed it to public_html/blog2. Note that I did not move any Wordpress files. Made the (I think) necessary changes all over Facebook, but still no dice... Any ideas on what can be happening?

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• Uniquely identify a mobile device

  - by Sahil Malik

  SharePoint, WCF and Azure Trainings: more information Sometimes you need to identify every device your app is installed on uniquely. This is for instance important where you have per-device licensing restrictions. For Win8 store apps, You can use ASHWID (Application Specific Hardware Identifier). ASHWID will be different app to app and device to device. Any hardware changes to the device will cause the unique id to change. You can also detect minor change vs. major change to build custom level of tolerance in what is considered a change. For instance, ejecting a USB stick is a minor change. The below code snippet shows you how to get the unique device id, Read full article ....

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• My ubuntuone is broken, what is the problem?

  - by user6962

  I am on 10.10 and u1sdtool seems to be completely broken. I reinstalled it, no change. I can add my PC to the account, but it is added twice(!) every time I tried. So I have my netbook and two times my PC in the account. The netbook with 10.04 has no problems. Below is the error msg I get when attempting to startup Ubuntu One on the command line. desktop:~$ u1sdtool --status Oops, an error ocurred: Traceback (most recent call last): Failure: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. desktop:~$ Starting it from the Me Menu has the same effect, the HDD will get really busy for a minute and then nothing happens, the client will not start. Nothing in the syslog or anywhere.

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• How can I force a preferred sound output device to be used?

  - by Dave M G

  In my sound settings interface, there are two devices for sound output: Both refer to the same physical device, which is a network sound device. Both work, but only with the second one, Simultaneous output to Kenwook Audio Device Digital Stereo (IEC958) on mythbuntu@mythbuntu, does the output volume respond to being changed. The first one always plays at the same level, and ignores volume settings. Every time I boot, the first one is selected. How can I make it so the second one is the default and the first one is disabled or at least never selected?

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• Not getting auto login page on my Hathway internet connection

  - by Vasu

  I am using firefox browser and my laptop is DELL Inspiron 1545. I am using Hathway internet connection. When i switch on my internet modem and try to use(browse any website), for the first time in a day it will redirect me to Hathway's login(something like "login.hatyway.com/.....") page automatically. It is working fine in windows but not in Ubuntu 11.10. So I go back to windows every time and then login and then i come back to ubuntu to use. Could you please let me know if there is a solution to this problem.

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• Asking about deleted partition at boot

  - by Shawn Mitchell

  I have Ubuntu installed through Wubi. I also had another partition on my computer to try out the dev preview of Windows 8 aptly named Windows_8. After I was done playing, I deleted the Windows 8 partition and added the extra space back to my Win7/Wubi partition. Now every time I boot into Ubuntu, it tells me that it can't mount the partition and asks me if I want to recover or skip it. Is there a way to get Ubuntu to forget about this partition so I can skip this extra step in my boot? Thanks

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• How to Restrict Android App Permissions

  - by Chris Hoffman

  Android forces you to agree to every permission an app wants, assuming you want to use the app. After rooting your device, you can manage permissions on a per-app basis. Restricting permissions allows you to protect your contacts and other private data from apps that demand access you’d rather not allow. Many apps will continue working properly after you revoke the permissions. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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• High I/O wait after login

  - by Jackson Tan

  I've noticed that the ubuntuone-syncdaemon hogs up the hard disk every time I log in to Ubuntu (10.04). This takes up to two or three minutes, which makes Ubuntu insufferably slow. Opening Firefox is okay, but the browser is constantly greyed out and lags horribly. Given that I often shut down my laptop when I don't use it (about 3 to 4 times a day), this makes Ubuntu lose much of its lustre because of its long boot time. Is this a normal behaviour of Ubuntu One? Is it intended? Note that I've actually posted this in the forums here, but I received only few replies.

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• Content appearing under multiple categories; anything I can do to prevent duplicate penalty?

  - by dave

  I'm working with a CMS that allows me to post content in to multiple categories. So, I have this link: www.site.com/category/green-cars Here are the GREEN cars TITLE: A Big green car INTRO: this is a great big green car. But then I have this link: www.site.com/category/big-cars Here are the BIG cars TITLE: A Big green car INTRO: this is a great big green car. So essentially - for every item of content, header and the intro sentence is the same regardless of the category the item appears in. Will a search engine penalise the site for having the same content in this way? I've looked at canonical links, but I don't think this is relevant here. All my content points to the same page - but the content may appear in multiple categories first. Or am I worrying about nothing? Thanks.

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• What constitutes proper use of threads in programming?

  - by Smith

  I am tired of hearing people recommend that you should use only one thread per process, while many programs use up to 100 per process! take for example some common programs vb.net ide uses about 25 thread when not debugging System uses about 100 chrome uses about 19 Avira uses more than about 50 Any time I post a thread related question, I am reminded almost every time that I should not use more that one thread per process, and all the programs I mention above are ruining on my system with a single processor. What constitutes proper use of threads in programming? Please make general comment, but I'd prefer .NET framework thanks EDIT changed processor to process

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