[Nouveau] [Bug 91333] Connecting second of two monitors to a Lenovo W520 causes displays to go crazy

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91333

--- Comment #5 from Corey Ashford <cjashfor at us.ibm.com> ---
(In reply to Ilia Mirkin from comment #4)
> I bet it works if you first disable one of the screens before plugging a
> third one in.

I had tried that experiment before, but I just now tried it again.  Same bad
result.  Here are the steps I took.

1) Boot laptop with no external monitors connected.
2) Attach Displayport-connected monitor.  All is well.
3) Disable internal monitor.  All is still well... now using only the external
monitor.
4) Plug in VGA monitor.
5) Nothing happens.
6) I bring up the Gnome Displays setting (not clicking anything yet), then the
system starts with its display resetting (or whatever it's doing), and becomes
unresponsive to keyboard input.
7) The only way to get back to a usable system is to disconnect the VGA
display, which after 5-10 seconds gets me back to the Gnome login, and after
logging in I was able to capture the dmesg output (will attach).

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