I'm also suffering this on my Debian wheezy system. The symptom is display frozen for 10 seconds, a flicker than returns to normal.
Here's the related dmesg output: Mar 24 11:36:06 server kernel: [ 8901.252040] radeon 0000:01:05.0: GPU lockup CP stall for more than 10000msec Mar 24 11:36:06 server kernel: [ 8901.252046] GPU lockup (waiting for 0x000170CC last fence id 0x000170CB) Mar 24 11:36:06 server kernel: [ 8901.253150] radeon 0000:01:05.0: GPU softreset Mar 24 11:36:06 server kernel: [ 8901.253153] radeon 0000:01:05.0: R_008010_GRBM_STATUS=0xA27334AC Mar 24 11:36:06 server kernel: [ 8901.253156] radeon 0000:01:05.0: R_008014_GRBM_STATUS2=0x00000103 Mar 24 11:36:06 server kernel: [ 8901.253159] radeon 0000:01:05.0: R_000E50_SRBM_STATUS=0x20000040 Mar 24 11:36:06 server kernel: [ 8901.253167] radeon 0000:01:05.0: R_008020_GRBM_SOFT_RESET=0x00007FEE Mar 24 11:36:06 server kernel: [ 8901.268052] radeon 0000:01:05.0: R_008020_GRBM_SOFT_RESET=0x00000001 Mar 24 11:36:06 server kernel: [ 8901.283921] radeon 0000:01:05.0: R_008010_GRBM_STATUS=0xA0003030 Mar 24 11:36:06 server kernel: [ 8901.283924] radeon 0000:01:05.0: R_008014_GRBM_STATUS2=0x00000003 Mar 24 11:36:06 server kernel: [ 8901.283928] radeon 0000:01:05.0: R_000E50_SRBM_STATUS=0x20008040 Mar 24 11:36:06 server kernel: [ 8901.284930] radeon 0000:01:05.0: GPU reset succeed Mar 24 11:36:06 server kernel: [ 8901.306127] [drm] PCIE GART of 512M enabled (table at 0x00000000C0040000). Mar 24 11:36:06 server kernel: [ 8901.306188] radeon 0000:01:05.0: WB enabled Mar 24 11:36:06 server kernel: [ 8901.338269] [drm] ring test succeeded in 0 usecs Mar 24 11:36:06 server kernel: [ 8901.338279] [drm] ib test succeeded in 1 usecs I don't have any /etc/X11/xorg.conf -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/936159 Title: Xorg freeze, radeon gpu lockup with softreset To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/936159/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
