Sorry to bump around this bug but I'm going to reassign this to the X server. LightDM and Unity Greeter don't change the default X settings so this is probably a case of misconfiguration or X setting a bad default.
** Project changed: unity-greeter => xorg (Ubuntu) -- 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/885394 Title: Greeter screen resolution too small for USB monitors (multiseat) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/885394/+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