Comment 7 for bug 345119

I'm experiencing random X freezes on my latitude d630 with intel i965gm gpu. It happens using composite effects with compiz or kwin. It still happens when having composite DISABLED - but more rarely. It usually happens for me from one to five times per day.
The mouse still moves, but no input is accepted. You cannot switch console or kill the x-server. You can still log in via ssh. If that's not available, the only help is a hard reset of the system.

I suspect this is similiar to bug 20560 - but more intel hardware suppers from that than only the i945. It may be even than this two.

There is a bug report in the fedora bugzilla too:
https://bugzilla.redhat.com/show_bug.cgi?id=464866

I first experienced this bug after having moved from Ubuntu 8.10 to fedora10 two month ago. It is still there in Fedora 11 Beta (intel 2.6.0). In the fedora bug report someone from arch-linux mentioned that this bug first appears in intel-2.5 . My oberservations confirm that as ubuntu 8.10 uses intel-2.4 .

I cannot reproduce this bug on Ubuntu 9.04 beta with a i915 chipset.

WORKAROUND:
The only solution I found is to put „NoAccel“ „yes“ in xorg.conf. Using XAA or tiling does not help.

Maybe important: It never happend when playing a 2D-windows game running fullscreen in wine in 1024x768 resolution. I played many hours, so it is really unlikely that I just had luck.

STEPS TO REPRODUCE:
This bug is triggered randomly. It happens during high activity and it happens when just moving the mouse. But I observed that the probability is higher when having action on your desktop. It happened most often for me when working with eclipse.
For triggering this bug I usually use compiz with many effects enabled. I open up and close applications by scripts every two seconds. When I start doing additional work on the desktop, the freeze always occured within 15 minutes.
The freeze most often occurs during compiz animations.