Radeon lockup on 3.8.5-201.fc18.x86_64

[Alex Deucher]

On Fri, Apr 5, 2013 at 5:11 PM, Andy Lutomirski <luto at amacapital.net> wrote:
> Every day or so, I'll click something and my screens go blank for a
> second or two.  dmesg complains about a lockup, and afterwards
> everything is painfully slow.  (Even switching focus to other emacs
> windows takes a second or two.)  Once this happens, if I restart X, I
> get a blank screen, although the mouse still works and I can switch
> VTs and use the console.

Try disabling hyperZ.  Set env var R600_HYPERZ=0 (mesa 9.1) or
R600_DEBUG=nohyperz (mesa git).

Alex