Comment 2 for bug 187383

The system felt a bit slow so I logged out. This wasn't successful, only all icons any everything disappeared now only showing my background picture. I tried using the keyboard but nothing worked. I did a SSH to the machine and logged in without any problems. Noticed Xorg process taking 100% CPU. Also noted this in kern.log:

Jan 30 19:58:16 pc-thnov-ubuntu kernel: [ 1157.675889] [fglrx:firegl_free_mutex] *ERROR* mutex id 0x00000005 not found in mutex list
Jan 30 20:03:31 pc-thnov-ubuntu kernel: [ 1232.819179] [fglrx] interrupt source 10000000 successfully disabled!
Jan 30 20:03:31 pc-thnov-ubuntu kernel: [ 1232.819189] [fglrx] enable ID = 0x00000000
Jan 30 20:03:31 pc-thnov-ubuntu kernel: [ 1232.819193] [fglrx] Receive disable interrupt message with irqEnableMask: 10000000; dwIRQEnableId: 00000008

Tried to kill the Xorg process but wasn't successful, not even with -9. /etc/init.d/gdm stop was also useless. Managed to reboot it with ctrl-alt-delete.

$ dpkg -l | grep fglrx
ii fglrx-amdcccle 8.452.1-1 Catalyst Control Center for the ATI graphics
ii fglrx-kernel-source 1:8-01+2.6.24.6-5.16 ATI binary kernel module source
ii xorg-driver-fglrx 1:7.1.0-8-01+2.6.24.6-5.16 Video driver for ATI graphics accelerators