For me it's actually not stable with 3.16 and 3.17 RC2. With or without radeon.dpm=0. If I set "echo dynpm > /sys/class/drm/card0/device/power_method" (as root) it lasts a little longer but after a couple of hours it does crash again. Radeon 7770 HD, Arch Linux. General question: Don't you guys think this is the same bug as https://bugs.freedesktop.org/show_bug.cgi?id=79980?