I had this problem repeat. A GDM restart isn't required to fix this. I dropped into a console and just set the resolution to 1680x1050 manually using xrandr and it comes back fine.
Still a bug that it happens in the first place! -- Screen randomly blanks with a "not optimum mode" monitor message https://bugs.launchpad.net/bugs/548956 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg 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
