On Fri, Apr 5, 2013 at 5:11 PM, Andy Lutomirski luto@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