Can you try if reverting revision 1.6 of radeon_cursor.c in X.org CVS makes a difference?
Reverting this file to version 1.5 caused the cursor to appear after the lockup, I could move it but everything else was fudged. During this test, I flipped my mouse over to make sure it would not move. It would seem that the cursor is related to the lockups I have experienced.
One more suggestion: try turning "SilkenMouse" off. I am not certain which option does it (I am away at a conference with really poor internet access), search google and the Xorg manuals.
Turning this option off might make mouse movements a bit jerkier, but will improve synchronicity in Xserver access to hardware..
best
Vladimir Dergachev
Thanks for your time, Jonathan
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