This problem exist since 3.10. linux 3.9 was very fine. I used to think this issue only happen when playing videos, but now, I find it makes no different, system freeze and not response at all (even the magic sysrq) after about one hour. I tested, when using chromium open a page and leave it there, system still freeze. And if screen goes black, it happens, too. I can't get any logs. linux 3.11-rc4, mesa git 20130805, xf86-video-ati 7.2.0, Acer v3 551G AMD A8 4500m + 7670M + 8G ddr3 mem I don't know if this related to radeon module, so i report it here again. see: https://bugs.freedesktop.org/show_bug.cgi?id=66738
You don't need to report it twice. Just stick with the original bug. All the developers are aware of all of both of the bugzillas.