Actually. it's reconfirmed; last time the ati module wasn't loading. It still throws the same error and segfaults. Here is the error log with Ubuntu packages from the official repositories.
** Changed in: xorg (Ubuntu) Status: Invalid => New ** Attachment added: "xorg log with official current packages" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1246991/+attachment/3898001/+files/XorgErrorCurrent.log ** Also affects: xorg-server Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1246991 Title: Xorg crashes on dual AMD/Intel Ivybridge setup Status in X.Org X server: New Status in “xorg” package in Ubuntu: New Bug description: Xorg segfaults right after loading the radeonSI module and initializing glamor if I have xserver-xorg-video-radeon installed. To get it working again I had to use my Ivybridge graphics exclusively and blacklist the radeon kernel module. Attached is the Xorg.0.log up until the error. I know the xserver- xorg-video-radeon package is newer, but I saw the same thing occurring with Ubuntu's default version. To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1246991/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp