Bug#469113: xserver-xorg-video-intel: Crash on VT switch (855GM)

[Willi Mann <willi@wm1.at>]

> If it's really crashing, you should see a backtrace at the end of
> /var/log/Xorg.0.log (please send this backtrace then). If it's a
> freeze/hang of the machine instead of a crash, it's harder to debug...

Sorry, no backtrace. The whole machine freezes.

>> I can't reproduce this with upstream git, pulled BEFORE the 2.2.1-1
>> release, but it was reproducable with the 2.2.0.90-3 debian package.
>> My git pull took place between those two upstream releases.
> 
> Did you pull from xf86-video-intel-2.2-branch or from the master branch?
> 2.2.0.90 and 2.2.1 come from the former, by default you get the latter.

I pulled from master. Are they really so much different? To be exact, I
pulled from master first some time after middle of December and upgraded
multiple times, but this bug never occured.

>> The main difference between my git pulls and the debian package is
>> probably that I always compile with -O0, while the debian package is
>> compiled with -O2 AFAIK.
> 
> It would be very nice to check whether -O0 is actually involved and
> to locate which commit introduced/fixed the problem (with git-bisect
> or so).

Yes, but that would require the bug to be always reproducable.
Currently, it's only sometimes reproducable.

Willi