Here is the Xorg.0.log file just after it fails. Error lines are:
[ 8.460] (EE) Screen 0 deleted because of no matching config section. [ 8.460] (II) UnloadModule: "vesa" [ 8.460] (EE) Screen 0 deleted because of no matching config section. [ 8.460] (II) UnloadModule: "modesetting" [ 8.460] Fatal server error: [ 8.460] Cannot run in framebuffer mode. Please specify busIDs for all framebuffer devices [ 8.460] [ 8.460] (EE) Please consult the The X.Org Foundation support at http://wiki.x.org for help. [ 8.460] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information. [ 8.460] (EE) [ 8.535] Server terminated with error (1). Closing log file. ** Attachment added: "Failing X log" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1129220/+attachment/3535025/+files/Xorg.0.0log.erreur -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1129220 Title: Fails to boot to X, but starting lightdm afterward works To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1129220/+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