I recently upgraded my system from Ubuntu 12.04 to 14.04. My dual monitors (which previously worked) now only mirror each other. I can't get them to stop mirroring, and one monitor has large black margins on the right and bottom edges.
lspci | grep AMD
gives Radeon X1300/X1550 as the graphics card.
When I click on "Displays", I see that the "Mirror displays" button is greyed out and is off. I have only one built in display detected, and clicking "Detect Displays" does not register the fact that I have two monitors.
I am using the default "radeon" Ubuntu driver. I have looked into the proprietary driver from AMD, but it was last updated in 2009 and (predictably) fails when I try to install it.
I know the X1300 is an old card - but is there any way I can configure it to run dual monitors on 14.04?