[Nouveau] [Bug 91333] New: 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

            Bug ID: 91333
           Summary: Connecting second of two monitors to a Lenovo W520
                    causes displays to go crazy
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: cjashfor at us.ibm.com
        QA Contact: xorg-team at lists.x.org

Created attachment 117104
  --> https://bugs.freedesktop.org/attachment.cgi?id=117104&action=edit
dmesg output from start to connecting the two monitors, then disconnecting the
VGA monitor

I am using a Lenovo W520 on Fedora 22.  What I'd like to be able to do is close
the laptop's display and use two external monitors.

I know that Optimus is troublesome in Linux, so I have disabled it, and am
using discrete graphics only (Nvidia Quadro 1000M, 108GLM).

When I plug in the first of the two external monitors via the Displayport
(converted to HDMI), everything works fine; I am able to use the laptop's
internal display and the external monitor.

When I plug in a second display via the VGA port, all of the screens go blank
for a time, and then only the Displayport-connected monitor comes up.  It is
usable for about 10 seconds, and then the internal display shows some boot up
messages, and the displayport-connected monitor shows the desktop, but I cannot
type anything.  About every three seconds, all screens blank out, and then the
process repeats.

My next step is to then disconnect the VGA monitor, and after about 10 seconds,
it puts me back at the Gnome desktop login.  From there I was able to log back
in and get the dmesg output (attached).

Looking at the dmesg output, there is a segfault in libmutter.  Perhaps this is
what is causing the problem.  I don't know.

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