[Bug 33368] Re: X freeze the computer (Dapper - glcore)

[inos]

I got the same on a IBM ThinkPad T20 (Dapper, happend with all kernel-versions, Breezy was fine). As the T21 has also a S3 Savage chip, it seems to be the same Bug as in 33617 (sorry, dont know how to insert a link).
so it is definitely related to DRI. (disabling DRI resolve the problem)
I found some further information on thinkwiki.org (www.thinkwiki.org/wiki/S3_Savage_IX8)

   Option     "BusType" "PCI"
   Option     "DmaMode" "None" 
in xorg.conf also resolve the issue but DRI is still disabled

hopefully you may further investigate the bug with this information

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X freeze the computer (Dapper - glcore)
https://launchpad.net/bugs/33368