(In reply to Jacob from comment #211)
> I looked back through kern.log and found the last time I encountered a
> crash, which happened to be with kernel 3.15.10 from the Ubuntu repo.
> That crash seemed to have been caused by dpm:
> [drm:si_dpm_set_power_state] *ERROR* si_set_sw_state failed

Jacob, please report a separate bug about your symptoms.

(In reply to Michel Dänzer from comment #210)
> One thing I find interesting is that only Southern Islands seems affected.

And Pitcairn too.

(In reply to Michel Dänzer from comment #207)
> In general, it's much better to
> track things separately.

Should the two bugs resolved as "duplicate" be de-duplicated then? Bug 80141
and Bug 82886.