Okay it was an old bug resurfaced by the looks of it.. there used to be code written by Felix in the radeon driver to always emit a zbs atom no matter what, I've spent two days staring at the driver and the attached patch looks to fix the gears crapping out ...
[...]
yes, your patch fixed the glxgears-lockup for me, too. Thanks!
It looks like this is only necessary on RV200 based chips, maybe a comment in the source about this behavior might be usefull, otherwise this workaround will get removed in the future again... because other radeons work well without it...
best regards, Andreas
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