I have a UX31a with Ubuntu 12.04 installed. I've managed to get almost everything working but i'm having a few issues when connecting to an external screen using the HDMI port.
Firstly, if i boot up with it connected then it will boot up using the external screen but the laptop screen is blank. Nothing i do can bring the laptop screen up. I've tried disconnecting the HDMI connector to see if it would switch back but nothing happens.
If i boot up not connected to the external screen and connect later everything is fine if the displays are mirrored. However, if i uncheck mirroring then after a minute the task bars disappear and the the computer goes into a semi freeze state. Things that are running continue but you cannot do anything else.
Any suggestions would be extremely welcome