On 12.04 with a Radeon HD 6400M, the kernel boot option "radeon.modeset=0" seems to solve the issue (almost).
Add this to /etc/default/grub: GRUB_CMDLINE_LINUX="radeon.modeset=0" Then run: sudo update-grub This solves the continuous switching in the first few minutes after login. However, it still happens once a week (?) that the settings automatically go from extended desktop to mirrored at 1024x768 once or twice per session long after login. There's still a bug in there somewhere... -- 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/907381 Title: Display resolution keeps switching with external monitor connected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/907381/+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
