[Bug 78987] black screen when trying to enable external VGA screen on Trinity APU laptop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78987

Lucas Stach  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |FIXED

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[Bug 78987] black screen when trying to enable external VGA screen on Trinity APU laptop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78987

--- Comment #6 from Lucas Stach  ---
Coming back to this after a long time. Meanwhile the APU is a Richland based
chip in the same laptop chassis. Behaviour stays the same.

What I found out is that VGA lights up if it is connected at boot up, but when
GDM tries to switch modes the ATOMBIOS hang is encountered again. So it seems
like disabling the encoder does not work properly and it's not coming back to
life when trying to enable it again. I've tried to disable various parts of the
encoder disable sequence, but didn't find anything that would make a
difference.

I would be very glad if someone with some more clue about this than me could
take a look at this. Do you need any more traces/registerdumps/infos?

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[Bug 78987] black screen when trying to enable external VGA screen on Trinity APU laptop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78987

--- Comment #5 from Lucas Stach  ---
I attached two xrandr outputs as running xrandr already triggers the problem.
So one log before and after the failure happened.

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[Bug 78987] black screen when trying to enable external VGA screen on Trinity APU laptop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78987

--- Comment #4 from Lucas Stach  ---
Created attachment 99475
  --> https://bugs.freedesktop.org/attachment.cgi?id=99475=edit
xrandr after failure

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[Bug 78987] black screen when trying to enable external VGA screen on Trinity APU laptop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78987

--- Comment #3 from Lucas Stach  ---
Created attachment 99474
  --> https://bugs.freedesktop.org/attachment.cgi?id=99474=edit
xrandr before failure

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[Bug 78987] black screen when trying to enable external VGA screen on Trinity APU laptop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78987

--- Comment #2 from Lucas Stach  ---
Created attachment 99473
  --> https://bugs.freedesktop.org/attachment.cgi?id=99473=edit
Xorg.0.log

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[Bug 78987] black screen when trying to enable external VGA screen on Trinity APU laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=78987

--- Comment #1 from Alex Deucher  ---
Please attach your xorg log and xrandr --verbose output.

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