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[iskarion <619376@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Binary package hint: xorg

I'm running Kubuntu 10.04 64 Bit and I'm experiencing the problem that
sometimes the X Server is freezing. I can still see the mouse cursor
moving, audio is also still playing. But no screen update is happening
and no screen interaction is possible anymore. Neither with the keyboard
nor with the mouse.

This is happening rather often when watching Flash videos in Firefox (Firefox 64 Bit 3.6.8, Flash 10.1.82.76 32 Bit with ndiswrapper). e.g. when watching videos at http://www.ardmediathek.de this is reproducible all the time. Not right at the beginning, but after watching videos there for a few minutes and jumping from one video to another, moving the mouse a bit and scrolling, the freeze is always happening.
Rarely the problem is also occurring with other applications (usually not easily reproducible). So it's not Firefox/Flash specific, but Firefox/Flash is the best way to reproduce it.

After the freeze has happened, the system is only reacting to the magic SysRQ keys. It's also possible to logon remotely via SSH to the system.
This way I can see that Xorg is stuck with 99% CPU load. I did try to regain control by killing various processes starting with Firefox, plasma-desktop,... But this doesn't help. Only a reboot is fixing this.

The issue is occurring on two different computers

One with a MSI H55M-ED55 board and Intel I5-661 CPU.
Another one with an Intel DG33TL board and Intel Core 2 Duo E8200 CPU.
So both with different generations of Intel.

Both running Kubuntu 10.04 64 Bit with all available updates applied.
xserver-xorg 1:7.5+5ubuntu1 (amd64)
xserver-xorg-video-intel 2:2.9.1-3ubuntu5 (amd64)
The second computer did run Kubuntu 8.04 32 Bit before, where this problem did not occur.

On the machine with the i5 CPU/IGP I did follow the instructions at
https://wiki.ubuntu.com/X/Troubleshooting/Freeze for getting an Intel
batchbuffer dump and did reproduce the bug with the mainline/drm-intel-
next kernel 2.6.34-997 available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/drm-intel-next/2010-06-02-lucid/

But even with this kernel /sys/kernel/debug/dri/0/i915_error_state says
"no error state collected". I did start apport before the propblem
occours, but also apport didn't collect any related information in
/var/crash.

Xorg.0.log, dmesg, /sys/kernel/debug/dri/0/915_ringbuffer_info see
attachments.

Please let me know if I shall provide any further information. I will
also try to get the batchbuffer dump on the other machine with the G33
IGP.

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

-- 
XServer freezing on Intel IGPs
https://bugs.launchpad.net/bugs/619376
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