Seems like you're having a problem with acceleration. Can you test ppa:canonical-x/x-staging ? And because you have problems with steam, can you make sure all the 32-bits libs are installed? libgl1-mesa- dri:i386 and libgl1-mesa-glx:i386 might be missing or corrupt.
** Changed in: xorg-server (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1335072 Title: Xorg crashed with SIGABRT To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1335072/+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