ubuntu-x-swat team mailing list archive

[Geir Ove Myhr <gomyhr@xxxxxxxxx>]

** Description changed:

  Binary package hint: xserver-xorg-video-intel
  
  On two computers of the model Dell Optiplex 760, Ultrasmall Form Factor
  the monitor shows some flickering kind of corruption when Xorg is
  started.
  
  Present when:
  - KMS is used, Monitor (Dell 20" 2007FP) connected via DVI-I cable to the DVI-I output of the computer and DVI-D input of the monitor
  Not present when:
  - UMS is used (i.e nomodeset boot option)
  - Monitor is connected using VGA (DVI-I to VGA adapter on computer, VGA input on monitor)
  - When booting a Lucid LiveUSB image
  (none of the not-present cases are thoroughly tested, so some of them may be coincidentally working when I tried it)
  Untested (so far):
  - Karmic LiveUSB image
  - With a different monitor
  
  Since the problem seems to be related to KMS I have tried the standard
  Karmic kernel, the mainline build [1] of 2.6.32 and the current Lucid
  kernel (2.6.32-7.10-generic) and they all show the problem.
  
  Problem description:
  Most times (i.e. not always) when the computer is booted, some colors will have flickering blue dots at various places. It seems that some of the dots are always present while others flicker on and off. It seems that some colors are more susceptible than others, and that shows up as bands of corruption in gradients (see attached photo of Ubuntu login screen). The exact pattern is a little bit different from boot to boot, sometimes it is worse and sometimes better. On a normal single-color brown desktop there are flickering blue horizontal lines every now and then spanning the whole desktop.
  Sometimes also the VTs and the usplash screen shows flickering blue dots on the black background.
  
  In order to get as much debug information as possible, I'm reporting
  this bug with `ubuntu-bug` running the Lucid kernel and the DRM KMS
  debug option drm.debug=0x04. [2]
  
  The corruption is only present in the native mode (0x40 1600x1200). If I
  select any of the other modes available from xrandr, there is no
  corruption. At least once the corruption has disappeared after switching
  to another mode and back again. (`xrandr --output HDMI2 --mode 0x41` and
  then `xandr --output HDMI2 --mode 0x40`). I can't reproduce this now (on
- 2.6.32-7), so it may be kernel dependent.
+ 2.6.32-7), so it may be kernel dependent. Also, the corruption does not
+ show up on screenshots (when viewed on another computer or another
+ resolution).
  
  As a side note, the DVI connection is reported as HDMI2 even though it
  is a DVI, but that is probably a separate issue.
  
  I was considering not reporting this, since I will only have access to
  this hardware for about one more week. However, I opted for filing a bug
  report it so that it may solve as a model bug report for others having
  the same problem.
  
  [1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/
  [2]: http://lists.freedesktop.org/archives/intel-gfx/2009-July/003310.html
  
  ProblemType: Bug
  Architecture: i386
  Date: Mon Dec  7 13:14:07 2009
  DistroRelease: Ubuntu 9.10
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
  MachineType: Dell Inc. OptiPlex 760
  Package: xserver-xorg-video-intel 2:2.9.0-1ubuntu2
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-7-generic root=UUID=6ca55718-1b9f-4ebb-b4b1-8175de7a008c ro quiet splash reboot=bios drm.debug=0x04
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-7.10-generic
  RelatedPackageVersions:
   xserver-xorg 1:7.4+3ubuntu10
   libgl1-mesa-glx 7.6.0-1ubuntu4
   libdrm2 2.4.14-1ubuntu1
   xserver-xorg-video-intel 2:2.9.0-1ubuntu2
   xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu1
  SourcePackage: xserver-xorg-video-intel
  Uname: Linux 2.6.32-7-generic i686
  XorgConf: Error: [Errno 2] No such file or directory: '/etc/X11/xorg.conf'
  XsessionErrors:
   (gnome-settings-daemon:1777): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
   (gnome-settings-daemon:1777): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
   (polkit-gnome-authentication-agent-1:1816): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
   (nautilus:1808): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
  dmi.bios.date: 08/17/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0G919G
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 16
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/17/2009:svnDellInc.:pnOptiPlex760:pvr:rvnDellInc.:rn0G919G:rvrA01:cvnDellInc.:ct16:cvr:
  dmi.product.name: OptiPlex 760
  dmi.sys.vendor: Dell Inc.
  fglrx: Not loaded
  system:
   distro:             Ubuntu
   architecture:       i686kernel:             2.6.32-7-generic

-- 
[Q45] Flickering corruption with KMS and DVI output
https://bugs.launchpad.net/bugs/493707
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