(In reply to Alex Deucher from comment #60)
> Can you see if disabling different dpm options helps?  Try to narrow down
> which one(s) are problematic.  E.g., this patch will disable all of them.
> 
> ...

So, I've never done this before but I managed to recompile the kernel with the
attached patch and boot from it.

I've been running on the performance_level auto setting for about an hour now
and haven't encountered the freeze. I'll be using it for a few hours tomorrow
to make sure but considering it usually takes only ~20 minutes to freeze, I'd
consider this version fixed.

On this note, I guess there are ways to apply a patch to the radeon driver
without recompiling the whole kernel? That'd make things less time-consuming.