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Thread: Black dots/lines randomly appear on screen

  1. #1
    Join Date
    May 2013
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    8

    Black dots/lines randomly appear on screen

    I have installed Ubuntu 13.04 on a Toshiba Satellite U845-S409 a week ago. Starting yesterday, every once in a while, there is a pattern of short, horizontal black lines that appear over the whole screen, which lasts about a second and then dissapears. Any thoughts on that?

  2. #2
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,697
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Black dots/lines randomly appear on screen

    Hi tyela. Welcome to the forum

    My first guess would be to check your graphic card and drivers.

    Could you open a terminal, run this commands and post the results?
    Code:
    lspci -nnk | grep -iA2 vga
    
    xrandr
    
    xvidtune -show
    
    lsmod | grep -iE 'nvidia|intel|fglrx|radeon|nouveau'
    Regards.

  3. #3
    Join Date
    May 2013
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    8

    Re: Black dots/lines randomly appear on screen

    Thanks! Here's what I get:

    Code:
    mon@eyvindur:~$ lspci -nnk | grep -iA2 vga
    00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09)
        Subsystem: Toshiba America Info Systems Device [1179:fba1]
        Kernel driver in use: i915
    mon@eyvindur:~$ xrandr
    Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
    LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
       1366x768       60.0*+
       1360x768       59.8     60.0  
       1024x768       60.0  
       800x600        60.3     56.2  
       640x480        59.9  
    VGA1 disconnected (normal left inverted right x axis y axis)
    HDMI1 disconnected (normal left inverted right x axis y axis)
    DP1 disconnected (normal left inverted right x axis y axis)
    mon@eyvindur:~$ xvidtune -show
    "1366x768"     69.30   1366 1398 1430 1470    768  771  776  786 -hsync -vsync
    
    mon@eyvindur:~$ lsmod | grep -iE 'nvidia|intel|fglrx|radeon|nouveau'
    kvm_intel             126842  0 
    kvm                   376505  1 kvm_intel
    aesni_intel            18156  2 
    aes_i586               16995  1 aesni_intel
    xts                    12749  1 aesni_intel
    lrw                    13057  1 aesni_intel
    ablk_helper            13357  1 aesni_intel
    snd_hda_intel          38307  3 
    snd_hda_codec         117580  3 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
    snd_pcm                80890  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
    snd_page_alloc         14230  2 snd_pcm,snd_hda_intel
    snd                    56485  16 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device

  4. #4
    Join Date
    Feb 2009
    Location
    Dallas, TX
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    6,697
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Black dots/lines randomly appear on screen

    Thanks.

    So far, so good. You have Intel integrated graphics, and you are using the proper driver.

    Let's see if there's something on the X log. Could you paste the content of this file?
    Code:
    /var/log/Xorg.0.log
    Please paste it here: paste.ubuntu.com, and post back the link to it.

    Regards.

  5. #5
    Join Date
    May 2013
    Beans
    8

    Re: Black dots/lines randomly appear on screen


  6. #6
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,697
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Black dots/lines randomly appear on screen

    Thanks.

    There no graphic error reported on the log.

    Let's check the version of your driver. Could you post the output of this command?
    Code:
    apt-cache policy xserver-xorg-video-intel
    Regards.

  7. #7
    Join Date
    May 2013
    Beans
    8

    Re: Black dots/lines randomly appear on screen

    Alright:

    Code:
    xserver-xorg-video-intel:
      Installed: 2:2.21.6-0ubuntu4
      Candidate: 2:2.21.6-0ubuntu4
      Version table:
     *** 2:2.21.6-0ubuntu4 0
            500 http://us.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
            100 /var/lib/dpkg/status

  8. #8
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,697
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Black dots/lines randomly appear on screen

    It looks like everything is OK.

    My only guess (not assuming hardware problems) would be that there's a flaw/bug on the 13.04 driver.

    There's only one version upstream you can upgrade to, but it falls into the "experimental/unstable" category.

    This would be the instructions to upgrade:
    Code:
    sudo add-apt-repository ppa:xorg-edgers/ppa
    
    sudo apt-get update
    
    sudo apt-get upgrade
    You may need to reboot after that.

    Let us know how it goes.
    Regards.

  9. #9
    Join Date
    May 2013
    Beans
    8

    Re: Black dots/lines randomly appear on screen

    Hi papibe,

    I upgraded the driver and the problem has not manifested itself since then (it used to be pretty frequent), so I'm going to assume that this is solved for now. I hope I'm not speaking too fast.

    In any case, thanks a lot for the help and for actually explaining what the instructions you're giving me are doing, it's much appreciated!

    Cheers.

    Alright, it seems that wishful thinking does not work and I have indeed spoken rashly. The problem is still there.
    Last edited by tyela; May 25th, 2013 at 09:05 PM.

  10. #10
    Join Date
    May 2013
    Beans
    8

    Re: Black dots/lines randomly appear on screen

    I was typing into terminal and the lines that appeared were now white instead of black. Also, they are more frequent when I do any kind of action. That is, they show up when I click something or give a command, rather than when the computer is idle. But it might be as small as moving the cursor... Not sure that's of any help.
    Last edited by tyela; May 25th, 2013 at 09:55 PM.

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