Comment 2 for bug 121018

I have similar broken behavior with my new Serp3. (Similar enough that I feared new report would be considered a dupe.)

Serp3, initial platform loaded, drivers applied, no meddling with Xorg, etc.

Attempting to toggle displays using Fn+F3 before GRUB loads have no apparent effect.

Attempting to toggle displays after Ubuntu has loaded result in video output being directed only to the secondary display. The output cannot be directed back to the Serval's display until the secondary display's connector has been removed.

When output is directed to the secondary display, the native resolution (and refresh rates?) are used, rather than those relevant to the secondary display.