Since reporting this problem I looked more closely at syslog. It looks like the ASIC hang was caused by my attemts to restart the system. In particular, it happens after "SysRq : SAK".
The real problem is a few lines earlier: [fglrx:firegl_lock_free] *ERROR* lock was not held by 12! (*lock=0x80000001) [fglrx:firegl_unlock] *ERROR* firegl_lock_free failed! Possibly related to bug 118605 ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/883803 Title: [fglrx] ASIC hang happened To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/883803/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
