For the history:
I experienced the same probem not on Ubuntu but CentOS 5.2. So I tried Fedora 9 
and the hang/lockup problem disappeared. However the display isn't good: In 
MythTV I can see the refresh line ; same playing any videos in mplayer
(phenomenon similar to this http://en.wikipedia.org/wiki/Page_tearing)...

So I installed Ubuntu (mythbuntu to be more accurate) 8.04-1. Problems
disappeared : perfect quality video.

Yesterday I upgraded to the latest intrepid : which installed intel driver 
2.4.1 and kernel 2.6.27-2....
Still no crash problem, but the tearing I experienced in Fedora 9 is there. 
When you have fast side motion you can see the refresh line it looks awful.

Will revert back to 8.04-1

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lockup on mac mini 945GM [8086:27a2]
https://bugs.launchpad.net/bugs/218334
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