[Bug 203339] New: AMDGPU: virtual_display disables physical outputs

[Bug 203339] New: AMDGPU: virtual_display disables physical outputs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203339

            Bug ID: 203339
           Summary: AMDGPU: virtual_display disables physical outputs
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.0.7
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: parker.l.reed@gmail.com
        Regression: No

Created attachment 282351
  --> https://bugzilla.kernel.org/attachment.cgi?id=282351&action=edit
Kernel log

Unable to tell if this is intended or if caused by a crash.

I have a monitor connected via HDMI. When I use the virtual_display kernel
parameter, only the virtual displays show up.

amdgpu.virtual_display=0000:07:00.0,2

Original patchset doesn't mention this usecase.

https://lists.freedesktop.org/archives/amd-gfx/2016-August/001058.html

Kernel log attached shows some crashes related to dce_virtual_crtc

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[Bug 203339] AMDGPU: virtual_display disables physical outputs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203339

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
(In reply to Parker Reed from comment #0)
> 
> I have a monitor connected via HDMI. When I use the virtual_display kernel
> parameter, only the virtual displays show up.

When you enable the virtual display option the real displays are disabled. 
That is the intended behavior.  It's not a crash just a warning.

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[Bug 203339] AMDGPU: virtual_display disables physical outputs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203339

Drath (kernel.org@drath.ru) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kernel.org@drath.ru

--- Comment #2 from Drath (kernel.org@drath.ru) ---
>When you enable the virtual display option the real displays are disabled. 
>That is the intended behavior.

Why, though? Is it necessary part of this functionality or is it just a
failsafe?

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[Bug 203339] AMDGPU: virtual_display disables physical outputs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203339

--- Comment #3 from Alex Deucher (alexdeucher@gmail.com) ---
(In reply to Drath from comment #2)
> >When you enable the virtual display option the real displays are disabled. 
> >That is the intended behavior.
> 
> Why, though? Is it necessary part of this functionality or is it just a
> failsafe?

It's a lot of work to make them all work together and it has not been
implemented.  Plus for he main uses of virtual displays (virtualized GPUs and
early bring up and emulation), there is no physical display hardware available
or it's not ready to be used.

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[Bug 203339] AMDGPU: virtual_display disables physical outputs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203339

vita.amaro@gmail.com (vita.amaro@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vita.amaro@gmail.com

--- Comment #4 from vita.amaro@gmail.com (vita.amaro@gmail.com) ---
But what if i need virtual display in order to use it as a second monitor via
vnc? There is no way...

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[Bug 203339] AMDGPU: virtual_display disables physical outputs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203339

--- Comment #5 from Alex Deucher (alexdeucher@gmail.com) ---
(In reply to vita.amaro@gmail.com from comment #4)
> But what if i need virtual display in order to use it as a second monitor
> via vnc? There is no way...

Patches welcomed.

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