Nouveau - Feb 2015 - [Bug 88947] "Unknown" display appears with no external display connected

https://bugs.freedesktop.org/show_bug.cgi?id=88947

--- Comment #1 from Alex Deucher <alexdeucher at gmail.com> ---
I'm guessing this is a muxed hybrid laptop?  We hit a similar issue in
radeon.
Basically the desktop environment doesn't understand muxed displays so it
reports the status of both GPUs.  Arguably vgaswitcheroo needs to be augmented
to properly report the mux information so userspace can do the right thing with
respect to muxed laptops, but a short term fix would be to just report
disconnected on whatever GPU is not currently selected via the mux.

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