More information from 201305-13489, the integrated graphic controller could be enabled / disabled in BIOS, if enabled, the graphic controller is [1002:9991] as well, and this issue could be reproduced.
Seems that the combination is the cause. -- 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/1231916 Title: AMD A6-5400k APU with Radeon HD 8600 - Failed to start X after Installation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1231916/+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