Comment 7 for bug 693754
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0e1f616
(Get the code!)
Please note that I've logged a ticket in Launchpad, but thought it best to report here also. Please let me know if you need anything else to get to the bottom of this.
This issue does appear to have occurred when the Radeon fence functions were changed between 2.6.32.x and 2.6.33. I'm afraid that I'm not terribly au fair with memory barriers and debugging GPU lockup issues, but tell me what is helpful in getting to the bottom of this matter as I can reproduce this every time on the current kernel and I would like to help get rid of this problem.