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• booting into 12.04 results in a purple sceen for just a second.

  - by Super Nathan

  I have a vanilla Ubuntu install running on an Ivy-Bridge ultrabook that is using Intel 4000 graphics. I have enabled autologin via a line in the lightdm config file. My boot is very fast, however, it is ugly. The screen will be black, all solid purple for a second, then Plymouth for a second, then desktop. I would really like to figure out what the solid purple is and how to remove it. I would like to either have a different color (black) or skipped entirely.

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• Can a local multiplayer iOS game display differently for each device?

  - by Rahil627

  I've seen games which display different data for two devices, but not more than two. If possible, can it be accomplished using GameKit? EDIT: More specifically, I was thinking local multiplayer via bluetooth or wi-fi on an iOS device. Most games I've seen display the same screen synchronized across all of the devices. I understand games that network across the internet do this, often using a server, but I haven't seen any examples of a 3+ device local multiplayer iOS game. I just want to make sure it wasn't some kind of limitation.

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• Animate sprite/texture position with VBO

  - by Dono

  I'm currently worlking on a renderer for my projects and I want animate a sprite on screen. I've got a spritesheet but I don't know what is the the best way to update the texture coordinates for each vertex. Update vertices then update vertex buffer. (Heavy ?) Send to the shader my texture coordinates (It is possible ?) Don't use VBO ? By the way, I've got this structure : Object class with Geometry (Faces + Vertex + Buffer) and Material (Shader + other stuff ) properties, it is a good structure ? Thanks!

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• credit or minclass does not work well with pam_cracklib.so in common-password (opeSuSe 11.3)

  - by Mario

  I'm trying to implement password complexities on my pdc. It's a samba PDC with openLDAP backend. I tried cracklib-check but it looks like that I should have a decent and localize version of password library since the library out there usually comes in english. I also have another consideration that we will allow users to use any kind of password - even though it's dictionary based - as long as their passwords integrated with low/upper alphabet, digits, and other characters such as '$' or '_' (pam_cracklib.so calls them as classes). So here is my /etc/pam.d/common-password: #password requisite pam_pwcheck.so nullok cracklib password requisite pam_cracklib.so minclass=4 reject_username ##password requisite pam_cracklib.so \ ## dcredit=-1 ucredit=-1 lcredit=-1 ocredit=-1 reject_username password optional pam_gnome_keyring.so use_autht_ok password required pam_unix2.so use_authtok nullok The first commented line (with #) was the default configuration of openSuse 11.3. The 2nd/3rd (with leading ##) is another configuration I use when minclass=4 line is commented out. By the way, I have 'check password script' = /usr/local/sbin/crackcheck -d /usr/share/cracklib/pw_dict and passdb backend = ldapsam:ldap://127.0.0.1 parameters in smb.conf and cracklib-check works fine too. So here is the test I conduct. I logon to windows and then change my password. Sometimes it works fine that it trows error message - which what I wanted, but simple password with only lower alphabets can pass windows change password. Maybe I should make a new library which incorporates local vocabularies, but a guy out there (raise your hand please if you read this :) ) also experienced the same trouble with english word. Besides, what we really want is to let user to choose 2 or 3 format password out of 4 classes. Is there a bug or something with pam module in openSuse 11.3? Thank you in advance. Regards, Mario

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• Double X-screens on one monitor

  - by user75226

  I have two monitors connected currently, my laptop display and an old dell monitor. For some reason one monitor (the dell) has double everything (it will make sense when you see the image). I think it came about when one day I tried using separate x-screen instead of just twin view for a specific reason I don't remember why (I was trying to get the Menu bar to show on my laptop monitor instead of the Dell I believe, it only shows up on the left-most monitor it seems) but anyhow I was wondering if anyone can help me fix this issue. Thanks.

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• External monitor with NO mouse cursor

  - by Csaba Nyerges

  I am using a Fujitsu Siemens Amilo L7310 laptop computer with an external monitor. I'm wishihg to use version 10.04. The problem is, when I plug my laptop into the external monitor with my laptop screen turned either on or off, I do not see the mouse cursor on the external monitor! The mouse cursor is still there, although invisible. If I connect the external monitor to my laptop before swithing both on, the same happens. Is there any solution to make the cursor appear on the monitor?

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• How can I keep the correct alpha during rendering particles?

  - by April

  Rencently,I was trying to save textures of 3D particles so that I can reuse the in 2D rendering.Now I had some problem with alpha channel.Some artist told me I that my textures should have unpremultiplied alpha channel.When I try to get the rgb value back,I got strange result.Some area went lighter and even totally white.I mainly focus on additive and blend mode,that is: ADDITIVE: srcAlpha VS 1 BLEND: srcAlpha VS 1-srcAlpha I tried a technique called premultiplied alpha.This technique just got you the right rgb value,its all you need on screen.As for alpha value,it worked well with BLEND mode,but not ADDITIVE mode.As you can see in parameters,BLEND mode always controlled its value within 1.While ADDITIVE mode cannot guarantee. I want proper alpha,but it just got too big or too small consider to rgb.Now what can I do?Any help will be great thankful. PS:If you don't understand what I am trying to do,there is a commercial software called "Particle Illusion".You can create various particles and then save the scene to texture,where you can choose to remove background of particles.

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• Just installed 12.10 with WUBI and get error

  - by John

  Goes to the terminal screen and says: [drm:drm_crtc_helper_set_config] ERROR failed to set mode on 'crtc:10] From what I gather, this is an issue with my monitor. Not sure. I am really new to this. I have a Compaq Presario running XP SP3 and am using a Sony Bravia 32" LCD TV as a monitor. Downloaded Ubuntu from, well,... Ubuntu. Used WUBI to install. I suppose it created its own partition because install never asked. Is there a work-around for this? I have tried everything I know of, given my very limited experience. Thanks in advance.

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• Unable to empty the rubbish bin

  - by gman

  When I attempt to empty the rubbish bin the preparing window opens but nothing happens. In testing I tried to delete 1 file from the rubbish bin and received a time-out error. No files are removed from the rubbish bin after this. I have added a screen shot that includes a display of system monitor that shows high CPU usage for trash and Nautilus; not sure whether it is related. Click for a full-resolution image. Also, on a separated note, Bleachbit was also freezing on me, which may or may not be related?

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• personality problem while learning web development [closed]

  - by Lazeera

  I work a lecturer and when I go home I find a lot of free time. The problem is that I spend most of my time in learning about web development. I don't go outside and don't meet people, I'm only in front of the screen drinking 4 cups of coffee (per day) and trying to learn many technologies related to web development. In the last, I don't learn things very well because I'm in a hurry. I know this place is for asking about programming but I want to learn from your experience regarding learning. How do you learn? How many hours do you spend in leaning a day? How can I organize my time so I can learn well and easily?

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• Ubuntu 12.04 Responsiveness Extremely Slow on Nvidia 8800?

  - by lynxie

  Just installed 12.04... This is the first time I run Ubuntu with the Unity UI, not a pleasant experience. The responsiveness is extremely slow (10s after a mouseclick), the screen flickers, etc, all right after logging in. Switching the display driver from Nvidia current to post-release doesn't help at all. What now? Can't go back, but Ubuntu is useless to me right now. What can I do? (The system is a Intel 4x2.4Ghz with 4Gb RAM and a Nvidia 8800.)

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• The application compiz has closed unexpectedly

  - by suhaas

  I have installed Ubuntu 12.10 on my desktop. (Pentium 4, 80 GB hard disk, 2 GB RAM, 32-bit CPU.) And I have installed Windows XP. I made a 40 GB partition for windows and 40 GB for Ubuntu. I installed Ubuntu and it said "installation is complete" and asked me to restart. I restarted the PC and logged in. After 1 minute I get a message like this: The application compiz has closed unexpectedly. Then I closed it. After that it just stays in blank screen nothing shows up. What should I do?

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• pygame.Rect around circle

  - by geekkid

  I'm trying to make a pong game in pygame , but i can't figure out how to but a ball circle , which i can create with pygame.draw.circle into a pygame.Rect object so i can use the colliderect function and manipulate the ball's position. For example, with rectangles, i can do something like this : rect = pygame.Rect(255, 255, 100, 100) pygame.draw.rect(screen, yellow, rect) and then when i change the pygame.Rect object position , the drawing primitives position also changes. How can the same effect be achieved when i want to draw a circle, instead of a rectangle? Thank you.

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• Netbeans 7.0.1 not opening

  - by z22

  I am working in Netbeans on Ubuntu for the last 4 months. But today when I opened Netbeans, it just got stuck in the Ubuntu launcher bar at the left side of screen. I have my project pending in Netbeans (which is not opening). I am stuck in this problem. I also rebooted Ubuntu a number of times, still the same. I can't open Netbeans. Why is this happening? What is the cause of this problem? What should I do? tried $gksu netbeans, nothing happens, $ prompt shown again.

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• Mouse Not Detected & Network Not Connected After Installing Ubuntu 12.04 Desktop via Live USB

  - by albus_severus

  I just recently (+- 30 minutes ago) install Ubuntu 12.04 Desktop on my pc (dual boot) via Live USB (i check the "automatically install upgrade" option when installing it). unfortunately, at the login screen after the installation finished (after reboot), i cannot use my mouse! also, an error message occur saying that network connection is not available. but, when i restart again and using the "try Ubuntu without installing" in the Live USB, the problems didn't occur. i tried to googling this but failed to find any solution. and yes, i am totally green on Ubuntu and Linux. so, please, help me on this. thanks in advance.

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• How do I set a custom resolution in 12.04 with a nVidia video card (9600 GSO)?

  - by Aaron Agarunov

  I have 32 bit 12.04 and my video card drivers are up to date at "304.64" yet my resolution appears capped at 1920x1080. I am trying to get the resolution to 2560x1440 or even higher, as I am running this machine on a 42" LCD through HDMI and the 1920x1080 resolution will not stretch to fit the screen and is therefore fairly zoomed in. The 9600 GSO supports up to 2560x1600, so this should be no problem for the card itself. I have tried using xrandr, which successfully creates the 2560x1440 60 hertz mode but does not allow me to --addmode or --output it in. I have tried working with the xorg.conf, but I actually can not find a way to create the file since when I try to, I am given an error message stating that the # of monitors I have does not match the # of screens I have. Can anyone provide some help or insight?

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• Mod_pagespeed, Varnish and Apache cache issues after new code pushes

  - by WerkkreW

  I have a rather strange issue. In my environment we are running a load balanced cluster of 8 apache servers with a master-master MySQL backend. In front of apache we have Varnish in the cache layer. We have been running Apache mod_pagespeed for several weeks now and for the most part it has been working great. The issue arises when we do fresh code updates from Git, and and/all of the JS/CSS assets change. Basically the problem appears to be two fold. One, after the code push we generally take the opportunity to flush varnish, restart apache, and restart varnish. In doing this all of the mod_pagespeed combinied/minified files are cleared out ensuring that all of the new JS/CSS assets are fresh. The problem is, upon doing this the file names that mod_pagespeed creates change, but the old files (appear) to be still cached for many people client side leading to very unexpected results. However, if we do not restart apache, the changes to the files may or may not appear client side due to the cached minified assets. The simple solution is to disable mod_pagespeed, however I would rather not do that as it has made a fairly large impact in performance. I feel as if there must be a better way to deal with the inconsistencies in cache between the client and server to prevent having people to go to great lengths or perform a large number of page refreshes to see a working page. I can provide configuration snippets if anyone needs them. If you would like to inspect the site, source, headers, or anything try the following addresses: http://wellplayed.org http://wellplayed.org/tv Thanks in advance!

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• How do you ensure consistent experience across multiple graphics cards (or even driver versions)?

  - by Grigory Javadyan

  So I was writing a simple 2D game with OpenGL and SDL and had this problem when there was awful tearing when running in windowed mode (even though I explicitly asked SDL_SetVideoMode to use double buffering). Didn't worry about it all too much because most of the time the game grabs the entire screen, windowed mode is just for debugging. Anyway, yesterday I updated my nVidia drivers and tearing disappeared, the game runs smooth and looks nice in windowed mode too. I can see how the problem may be in the graphics driver, but this leads to a question. Obviously, professional game developers have to deal with a lot of different hardware/software configurations. What are the techniques they use to make sure the game looks the roughly the same on different graphics cards or even the same model of graphics card, but with different driver versions?

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• Quantal upgrade broke my gnome-shell!

  - by hwjp

  Just updated to quantal 12.10, and Unity works fine, but and I can't get gnome-shell to work :( Some symptoms: when using gdm as the default, it decided to display everything in chinese. When attempting to log in, it accepts the password, and then seems to crash when trying to load my desktop, and seems to restart gdm and send me back to the login screen when switching to lightdm as the window manager, it gets a little further (and in english), bringing up a desktop, but a broken one -- the propeller key doesn't bring up a menu, there's no menubar or notifactions area. i can do a few things, like bring up a terminal with ctrl+alt+t, and launch eg firefox from there, but not much else. I have tried uninstalling gnome-shell, deleting /etc/gdm, and reinstalling Any other suggestions? Which log files to look at for example?

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• What techniques can I use to render very large numbers of objects more efficiently in OpenGL?

  - by Luke

  You can think of my application as drawing a very large ball-and-stick diagram (or graph). At times, this graph can get very large, where the number of elements even outnumbers the pixels on the screen. Currently I am simply passing all of my textures (as GL_POINTS) and lines to the graphics card using VBO's. When the number of elements outnumbers the number of pixels, is this the most efficient way to do this? Or should I do some calculations on the CPU side before handing everything over to the GPU? If it matters, I do use GL_DEPTH_TEST and GL_ALPHA_TEST. I do some alpha blending, but probably not enough to make a huge performance difference. My scene can be static at times, but the user has control over a typical arc-ball camera and can pan, rotate, or zoom. It is during these operations that performance degradation is noticeable.

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• Particles are not moving correctly [closed]

  - by cr33p

  I want to make a particle explosion, after something gets destroyed, but somehow only one line of mixed colors show up on the screen. Here's the header: http://pastebin.com/JW5bPLj2 Here's the source: http://pastebin.com/KHmFqytD I don't get what's wrong, as it's nearly the same as in "Programming Linux Games" Can somebody help me fix that? PS: "Uint32 delta" is needed to update the pixels based on time. PSS: Maybe I should add that it's programmed in C and includes SDL. EDIT: Found the problem. It was the "drawParticles" function. The problem was, that I passed a double to "offset" (as particles[i].x, etc are all doubles). So I ended up with values like ~MAX_INT because I didn't cast the doubles properly to ints.

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• Native mobile app development - how do I structure my user stories?

  - by richsage

  I'm about to start on a project which will involve developing prototype native mobile apps (iOS and Android initially) as well as a web-based admin interface and an API for these apps to communicate with. We've got a list of stories already drafted up, however a lot of them are in the format: As a mobile user I want to be able to view a login screen so that I can sign into the app If this were targeted for a single platform, I wouldn't see a problem. However, since we're targeting multiple platforms, I'm not sure whether these should now be duplicated eg "As an Android user" or similar. This seems like duplication, but it's work that will need to be completed separately for each platform. This is the first mobile project we've gone native on - previously it was Phonegap and we lumped all stories in under "As a mobile user". Since essentially this was a web-based app wrapped in native code, this didn't present too much of an issue, but I'm conscious that wholly-native apps are a different ballgame!

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• Xubuntu and other Debian based distros slow

  - by William V

  I have a Compaq Presario SR1950NX desktop computer with the AMD64 3800+ processor and 1GB ram and it seems that Ubunutu, Xubuntu and Lubuntu are all laggy. Things seem to be slow such as clicking on menus and opening programs and the UI renders in peices. When using the browser the system slows down considerably. I ran the TOP command and I do notice that xorg hits 30 to 40 percent cpu when running the browsers. I have tried these distros on a spare P4 machine and it is even worse. As long as I don't have a several things open at one time I can manage to get around although sluggishly. I also notice that I can't get debian based distros to install in 64bit (crtc6 failure) only in 32bit. Can anyone tell me what is it that I might be doing wrong? I have an integrated Nvidia card and have tried several of the recommended drivers which sometimes result in no boot screen upon reboot. Thanks

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• Bug? Flash of white when changing orientation on iOS Safari [migrated]

  - by Baumr

  What causes the flash of white to the right of a responsive design when changing orientation from portrait to landscape on iOS? Try it on iOS6 Safari: Websites like this don't do it: http://html5boilerplate.com But this one does: http://www.initializr.com Something to do with re-processing (CPU lag) to fit a wider screen? It doesn't happen in Chrome for iOS6... Update: I just removed all img and from my testing site, but it still happens. This seems to happen with a lot of different websites out there. Is it a bug with their code, or a Safari for iOS bug? Others are completely immune to it...

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• Logitech Wireless Keyboard & mouse not working aftesr upgrade to 12.04?

  - by deerjay99

  I upgraded my Dell Dimension 9200C to 12.04 Precise Pangolin with no issues, I ran it fine for a night but when I went back in a couple days later my Logitech Wireless Keyboard K350 and M510 mouse weren't active when booted. I can boot into an older version from the main the boot screen the mouse and keyboard work, but the network stack is gone. It says the networking manager on this version is not compatible. I'm scratching my head, it isn't the mouse and keyboard, they work fine on my dual boot, and they load fine in Knoppix. They did work fine on 12.04 for 1 night. Open to suggestions before I re-install completely.

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