I had the exact same problem on my lenovo X200. I could solve it by disabling "Execution Prevention" in the BIOS under Security -> Memory Protection. After I set it to "Disabled", Ubuntu booted again without any problem.
-- [g45] No DRM, high cpu usage by X on rendering and frequent X crashes on Intel(R) G45/G43 Integrated Graphics Chipset https://bugs.launchpad.net/bugs/472506 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in ubuntu. _______________________________________________ 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
