This is till happening for me in ubuntu 13.10, so I did the "apport- collect -p xorg REPLACE-WITH-BUG-NUMBER" command in 14.04
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1213718 Title: Unity and Gnome-Shell often crash during graphics intensive activity (e.g. streaming video or playing games) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1213718/+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