[Bug 108561] New: nouveau: external monitor can not be enabled with hindsight

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=108561

            Bug ID: 108561
           Summary: nouveau: external monitor can not be enabled with
                    hindsight
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET
                    2015
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: estellnb at elstel.org
        Regression: No

Whenever I boot without an external monitor enabled then I get problems trying
to enable my u2868pqu monitor with hindsight. Xorg will recognize and it will
let me configure the external monitor. However the external monitor will stay
black and without a signal in spite of being configured well.
  If I just reboot the X-server with the monitor cable unplugged then there
will be no problem in enabling my u2868pqu monitor. Consequently I would assume
this to be a kernel / nouveau module bug since it depends on boot time not on
the time when I start the X-server.
  Is there any way to post the external monitor if I have booted without it?
What would you believe is going wrong here with nouveau and the HDMI port?

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