Here, instead of xorg-edgers use this PPA. I pulled out just the mesa package, so should be easier to install/uninstall for you:
https://launchpad.net/~ubuntu-x-swat/+archive/mesa-8.0.1 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/932900 Title: Unity freeze, crashes when trying to restart - intel_do_flush_locked failed: Input/output error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/932900/+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