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Thread: Flickering screen

  1. #1
    Join Date
    Sep 2008
    Beans
    10

    Flickering screen

    Okay, hope someone can shed some light on this.

    After my upgrade from jaunty to karmic, my screen starts flickering random and I can press CTRL+ALT+F1 and back and it stops flickering. However, the textures looks completely messed up, I have relog for it to become normal again. These flickering are completely random, when I play a movie, gaming, or just surfing the web. So I thought it might be something from the upgrade, so I made a clean install, but the problem didn't go away.

    I'm thinking that this could either be a driver issue OR it could be a bug in xorg. So I wonder if any else out there have experience any similar behavior.

    I'm having a Nvidia graphic card, Geforce GTX 260 and the nvidia driver 185.18.36.

    Any response is appreciated.

  2. #2
    Join Date
    Mar 2007
    Beans
    127
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Flickering screen

    I experienced the same issue with an upgrade to 9.10. I had a custom xorg.conf that I overwrote and there was a bit of flickering and then what appeared to be dead pixels (various shades of red and orange) on the screen. I reset but it didn't go away. Finally, I checked both my DVI cables and they were loose. Tightening them up caused the pixels to go away and the flicker to stop.

    This might not help, but its a first step.

    There's also a bug report filed by a few folks who were having the same issue:

    https://bugs.launchpad.net/ubuntu/+s...er/+bug/443223

    Looks like it might be an issue with gtk+ as well.

  3. #3
    Join Date
    Mar 2007
    Beans
    127
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Flickering screen

    This was also posted a few hours before yours:

    http://ubuntuforums.org/showthread.php?t=1324239

  4. #4
    Join Date
    Sep 2008
    Beans
    10

    Re: Flickering screen

    Thanks for your reply.
    I was away during the weekend, so couldn't reply.

    Anyways, I checked the first post, and that doesn't affect me at all. And then I checked the second one and it doesn't seem to affect me either, since my monitor is detected and has always been ever since Ubuntu 7.04.

    This issue is driving me crazy, it appears totally random, just happened a few minutes ago. I'm thinking about reverting to 9.04 that worked perfectly well for me, but it's kinda ridiculous.

  5. #5
    Join Date
    Sep 2006
    Beans
    1,610
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: Flickering screen

    Have a look at one of the many HOWTOs.
    sı ɯǝ1qoɹd ɹnoʎ ʇɐɥʍ ǝǝs ı ʞuıɥʇ ı

  6. #6
    Join Date
    Sep 2008
    Beans
    10

    Re: Flickering screen

    Okay, let me update. This wasn't solved after trying out this howto:

    http://ubuntuforums.org/showthread.php?p=8302145

    I have an Acer monitor labeled, AL1916W, when I went into menu, I found out it's HorizSync and VertRefresh, which was:

    HorizSync: 55 Khz
    VertRefresh: 59 Khz, but when I ran as in the example of the guide:
    Code:
    cvt 1440 900 60
    I got this:
    Code:
    # 1440x900 59.89 Hz (CVT 1.30MA) hsync: 55.93 kHz; pclk: 106.50 MHz
    Modeline "1440x900_60.00"  106.50  1440 1528 1672 1904  900 903 909 934 -hsync +vsync
    My screen still goes flickering/freezing at random times, my current xorg looks like this now:

    Quote Originally Posted by xorg.conf
    Section "Monitor"
    Identifier "Monitor0"
    HorizSync 55
    VertRefresh 59
    VendorName "Acer"
    ModelName "AL1916W"
    EndSection

    Section "Screen"
    Identifier "Default Screen"
    DefaultDepth 24
    EndSection

    Section "Module"
    Load "glx"
    EndSection

    Section "Device"
    Identifier "Default Device"
    Driver "nvidia"
    Option "NoLogo" "True"
    EndSection
    I'm not sure what else I can provide.

    I can (sometimes) change session and back with CTRL+ALT+FX, but the textures are all messed up, however, if I restart an application that have textures messed up, it becomes normal. Sometimes my computer hangs at the beginning of these freeze/flickering, and I can't do anything else then hard-reboot.

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