Based on the descriptions here - particularly the fact that it goes away
with DRI disabled - this sounds a LOT like the AGPMode settings are
incorrect. Please test this by adding this option to your
/etc/X11/xorg.conf's device section:
Section "Device"
...
Option "AGPMode" "2"
EndSection
Valid values of AGPMode are 1, 2, 4, and 8. 4 is a typical default but
some hardware needs a different value. AGPMode only comes into play
with DRI enabled - which is why the hangs go away with DRI disabled.
Also, it can be triggered by various things - starting a 3D game, a
suspend/resume cycle, starting up compiz, or even just booting up.
Anyway, if you find an AGPMode value that makes the issues go away, we
may be able to put in a 'quirk' so the Xserver always uses that value
for your particular combination of hardware. To help us do this, please
test each of the 4 values and provide the following data:
* AGPMode value(s) that work
* Make/Model of laptop or motherboard
* Output of lspci -vvnn
* Is the system all factory hardware, or have any parts been replaced?
* Is there an AGP Mode in the system BIOS?
- If so, is it set to the factory default?
--
DRI lockup with AGP on ati (mobility radeon rv350)
https://bugs.launchpad.net/bugs/141551
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