desktop-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Jan Rathmann, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect -p xorg 1325940

Please ensure you have the package xdiagnose installed, and that you
click the Yes button for attaching additional debugging information.

** Package changed: xserver-xorg-video-ati (Ubuntu) => xorg (Ubuntu)

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1325940

Title:
  Desktop sometimes comes up with undisplayable screen resolution

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Hello,

  the PC from which I'm sending this report sometimes fails to boot into
  the desktop properly (which desktop environment doesn't seem to
  matter). In the failure case the following happens:

  - The Plymouth Ubuntu splash gets displayed, but it looks distorted.
  Flickering horizontal artifacts are shown all over the screen, it
  looks a bit like a CRT Television with low signal.

  - When the desktop is loaded (via autologin), one can see short
  glimpses of its wallpaper, but after a few second the screen becomes
  black and remains that way. The monitor _does_ seem to receive a
  signal though.

  - It is possible to switch to TTYs and to use them, but they show
  similar artifacts like the Plymouth logo.

  - If I query the display information on the monitor's OSD when the
  screen is distorted, it reports a resolution of 1681x1050 or
  1683x1050, which is 1-3 pixel bigger than the native horizontal
  resolution of the 22" LCD screen.

  Switching between different resolutions via entering 'xrandr --size
  1024x768' blindly, followed by 'xrandr --size 1680x1050' brings up the
  native resolution properly.

  This does not happen on every boot, only in ~10-15% of the cases. I
  was not able to find any pattern so far in the occurence of this bug.
  The only thing I observed is that it _never_ happens when Windows XP
  is started, thus my assumption is that the bug is related to the
  xserver-xorg-video-radeon driver.

  I tried to specify the correct resolution explicitly on the kernel
  command line(adding video=DVI-I-1:1680x1050 ) but this has no positive
  effect.

  The monitor is connected via DVI.

  Below is a video attached that tries to show how the TTYs look when
  this bug occurs. Notice the abnormal blue lines, which are constantly
  flickering.

  Kind regards,
  Jan

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-radeon 1:7.3.0-1ubuntu3.1
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Tue Jun  3 13:23:38 2014
  InstallationDate: Installed on 2014-04-22 (41 days ago)
  InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: No upgrade log present (probably fresh install)

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