I have built a kernel from the upstream mainlinekernel following this doc: https://wiki.ubuntu.com/KernelTeam/GitKernelBuild
The kernel was version 3.9-rc4. Booting in to this v3.9 kernel has solved my problem. Looks like there were a lot of commits in the drivers/gpu/drm/radeon area going from v3.8-rc7 to the v3.9-rc4 kernel, including these three commits against the radeon r6xx driver: ca57802 drm/radeon: halt engines before disabling MC (6xx/7xx) f13f773 drm/radeon: use status regs to determine what to reset (6xx/7xx) d3cb781 drm/radeon: rework GPU reset on r6xx/r7xx I shall keep using my v3.9 custom kernel until the v3.9 kernel is adopted by raring. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1159414 Title: Xorg freeze - GPU lockup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1159414/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
