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[Ky Weichel <kweichel@xxxxxxxxxxxxxxxxxx>]

I was experiencing this problem with a Dell Dimension 2300 desktop
(Intel 82845G/GL[Brookdale-G]/GE Graphics Chipset).

Speculating that this was a configuration issue in Karmic, I switched
back to using an xorg.conf file I had used with Jaunty after following
this guide: http://ubuntuforums.org/showthread.php?t=1130582 to improve
graphics performance in Jaunty.

I have not experienced a freeze since I started using this xorg.conf
file again.  I think the reason may be that it disables tiling.  From
the guide:

"N.B.: If you are using an Intel 8xx chipset, tiling cause instability
unless you use the Bleeding-Edge configuration. Therefore: if you are
using the Safe/Optimal configurations, set tiling to false; if you are
using the Bleeding-Edge configuration, set tiling to true."

The "Bleeding-Edge" configuration it refers to involved using drivers
from the xorg-edgers PPA.  I was using the "Optimal" configuration and
therefore set tiling to false in my xorg.conf.  What I suspect is that
Karmic's default intel driver has this tiling issue, and it is enabled
by default for those who do not use an xorg.conf.

** Attachment added: "xorg.conf with tiling disabled (among other settings)"
   http://launchpadlibrarian.net/37715512/xorg_notiling.conf

-- 
[i845G] Karmic stops responding a few minutes after log in
https://bugs.launchpad.net/bugs/456902
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which is the registrant for xf86-video-intel.