Created attachment 68149 [details]
relevant log part

I have a multiseat setup with two radeon cards, 5450HD and 3650HD, I was
playing urbanterror on the seat that uses 3650HD and the gpu stalled.

my kernel version is 3.6.0, libdrm, mesa and xf86-video-ati are from git where
the last update was yesterday.

I'm attaching the relevant part from /var/log/messages.

yesterday I've played the same game on the same setup and it didn't stalled.