This is not a bug with open-source ati/radeon driver because you're using fglrx/Catalyst driver. I'm marking it as a kernel bug since it's not clear what's causing the issue.
** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu) ** Summary changed: - shut down fails + [Acer AO772] shut down fails -- 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/1013620 Title: [Acer AO772] shut down fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1013620/+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