[Bug 310857] [NEW] intel driver seems to get stuck in an EDID-fetching loop

[Colin Watson]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

This bug seems to be new on upgrade to jaunty.

After a period of use, X gets incredibly slow - scrolling a terminal
window takes seconds to redraw, the mouse pointer is jerky, top shows X
taking 40% of CPU, etc. Xorg.0.log shows a very long repeated sequence
of:

(II) intel(0): EDID vendor "LPL", prod id 50432
(II) intel(0): DDCModeFromDetailedTiming: 1280x800 Warning: We only handle separate sync.
(II) intel(0): EDID vendor "LPL", prod id 50432
(II) intel(0): DDCModeFromDetailedTiming: 1280x800 Warning: We only handle separate sync.
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1280x800"x0.0   75.50  1280 1344 1392 1512  800 803 809 832 -hsync -vsync (49.9 kHz)
(II) intel(0): Modeline "1280x800"x0.0   75.50  1280 1344 1392 1512  800 803 809 832 -hsync -vsync (49.9 kHz)

... and it's clear from 'tail -f' that it's repeating this sequence
quite rapidly. The full log also shows these messages before it really
gets stuck into the loop:

(EE) intel(0): underrun on pipe B!
...
exaCopyDirty: Pending damage region empty!

The Xorg.0.log that ubuntu-bug should attach is from a more or less
working system, before X slows down (but all the same package versions);
I'll attach a much larger (but gzipped) log from a broken system in a
moment.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
NonfreeKernelModules: wl
Package: xserver-xorg-video-intel 2:2.5.1-1ubuntu7
ProcEnviron:
 LC_COLLATE=C
 PATH: custom, user
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersion: Linux version 2.6.28-3-generic (buildd at palmer) (gcc version 4.3.3 20081210 (prerelease) (Ubuntu 4.3.2-2ubuntu8) ) #4-Ubuntu SMP Fri Dec 12 22:48:15 UTC 2008

SourcePackage: xserver-xorg-video-intel
Uname: Linux 2.6.28-3-generic i686
xkbcomp:

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug

-- 
intel driver seems to get stuck in an EDID-fetching loop
https://bugs.launchpad.net/bugs/310857
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