[Bug 100465] Hard lockup with radeonsi driver on FirePro W600, W9000 and W9100

https://bugs.freedesktop.org/show_bug.cgi?id=100465

--- Comment #5 from Alex Deucher alexdeucher@gmail.com --- (In reply to joro-2013 from comment #4)

I've noticed the same difference on my ancient mac mini G4 with a humble RV280 GPU. I try to boot it in AGP mode from time to time after applying some patches, just for fun. Before i would see some GPU lockup-resetting stuff (it always locks up after some time and never recovers) in kern.log, lately it just locks up and there's nothing in the logs.

I think the problem is your case is AGP and Mac. AGP is notoriously unreliable and the Apple northbridge had additional coherency problems.