Nouveau - Dec 2018 - [Bug 109187] New: [NVC1][optimus] nouveau black display, only mouse cursor visible

https://bugs.freedesktop.org/show_bug.cgi?id=109187

            Bug ID: 109187
           Summary: [NVC1][optimus] nouveau black display, only mouse
                    cursor visible
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: dominik at greysector.net
        QA Contact: xorg-team at lists.x.org

Created attachment 142919
  --> https://bugs.freedesktop.org/attachment.cgi?id=142919&action=edit
Xorg.log with intel+nouveau drivers

I'm getting black output on HDMI-connected display driven by nVidia GeForce
GT
525M (GF108M). Mouse cursor is visible on both built-in display and on the
external HDMI-connected display. This used to work on Fedora 27. I can see this
on Fedora 29, but I can't pinpoint which package update broke it because I
haven't checked the external display (a projector) for quite some time. This
machine is a Dell XPS 15 L502X with Intel HD3000 integrated graphics and nVidia
GeForce GT 525M discrete GPU in Optimus configuration. Here's my xorg.conf
snippet:

Section "Monitor"
        Identifier "Internal LCD"
        DisplaySize 345 195
EndSection

Section "Monitor"
        VendorName "Benq"
        ModelName  "W1100"
        Identifier "Projector"
        DisplaySize 16900 9400
EndSection

Section "Device"
        Identifier "Internal Graphics"
        Driver     "intel"
        Option     "Monitor-LVDS1" "Internal LCD"
        Option     "TearFree" "on"
EndSection

Section "Device"
        Identifier "Optimus Graphics"
        Driver     "nouveau"
        Option     "Monitor-HDMI-1-2" "Projector"
EndSection

Switching both drivers to "modesetting" makes the issue go away.
I'm attaching
Xorg logs for both configurations.

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--- Comment #1 from Dominik 'Rathann' Mierzejewski <dominik at
greysector.net> ---
Created attachment 142920
  --> https://bugs.freedesktop.org/attachment.cgi?id=142920&action=edit
Xorg.log with modesetting driver

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Do you still get the problem if you use intel as the main driver and
modesetting as the "GPU" driver?

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--- Comment #3 from Dominik 'Rathann' Mierzejewski <dominik at
greysector.net> ---
Created attachment 142925
  --> https://bugs.freedesktop.org/attachment.cgi?id=142925&action=edit
Xorg.log with intel+modesetting drivers

Yes, the same thing happens with intel driver for the integrated GPU and
modesetting for the nVidia GPU. Xorg.0.log attached.

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Dominik 'Rathann' Mierzejewski <dominik at greysector.net>
changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NVC1][optimus] nouveau     |[NVC1][optimus] nouveau
                   |black display, only mouse   |black display, only mouse
                   |cursor visible              |cursor visible when using
                   |                            |intel driver for integrated
                   |                            |GPU

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #4 from Martin Peres <martin.peres at free.fr> ---
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