You are using cloned mode, which is the default if you've plugged in the monitor before logging in. It's using the highest common resolution for both monitors.
** Changed in: xorg (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/947087 Title: wrong resolution, unity does not exist To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/947087/+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