While it may feel like an Xorg freeze, actually from your logs I'm not seeing anything that indicates X is complicit. Retargeting to the kernel.
sock_aio_read() sounds like it might be happening in some asynchronous I/O. However, the dmesg you posted only starts at 19199 sec, so might be missing some pertinent information. I would suggest reproducing it again and collecting dmesg quickly after the problem starts, so it show the period both before and after the fault started. ** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: New => Incomplete -- 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/917668 Title: system freeze ("hard LOCKUP"), warn_slowpath_common+0x7f in sock_aio_read To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/917668/+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