I'm experiencing reproducible Xorg lockups after upgrading to xf86-video-ati-6.7.192 when starting compiz (0.5.2). Lockups freeze everything, I have to do a hard reboot after. However, I got compiz working after downgrading to 6.6.193. I'm unsure which further information to submit, Xorg.log is clean AFAICT.
Created attachment 11528 [details] Xorg.log
You should try with current git master. Its latest commit (0241cac643fa1c08a45ea44f5c670b290e760ad8) seemed to help for me. I got very few lockups recently, the only one I remember of occured when rotating the cube while glxgears was running (while I got lots of lockups with plain Compiz before this commit).
Alright, got it working with current git master. That makes this a regression introduced after 6.6.193, present in 6.7.192, but fixed between 6.7.192 and commit 0241cac643fa1c08a45ea44f5c670b290e760ad8.
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