Probably because you have SIS graphics hardware. The driver for this is not very well maintained. Refiling.
** Package changed: xorg-server (Ubuntu) => xserver-xorg-video-sis (Ubuntu) -- Cannot find right resolution and aspect ratio as supported by monitor and video card. Ubuntu gives a lower resolution https://bugs.launchpad.net/bugs/537232 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-sis 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