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

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

[bugzilla-daemon]

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

          Priority: medium
            Bug ID: 78987
          Assignee: dri-devel@lists.freedesktop.org
           Summary: black screen when trying to enable external VGA screen
                    on Trinity APU laptop
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: dev@lynxeye.de
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 99447
  --> https://bugs.freedesktop.org/attachment.cgi?id=99447&action=edit
dmesg from failing machine

Plugging in an VGA monitor and trying to enable it results in black screen on
both the internal laptop display as well as the external VGA monitor.

The graphics is dead after this, I have not found any way to restore the
screen. However the machine is still responding to ssh and I was able to pick
up an quite interesting dmesg snapshot.

If you need me to test patches or need any other information, just ping me.

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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 <agd5f@yahoo.com> ---
Please attach your xorg log and xrandr --verbose output.

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

[bugzilla-daemon]

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

--- Comment #2 from Lucas Stach <dev@lynxeye.de> ---
Created attachment 99473
  --> https://bugs.freedesktop.org/attachment.cgi?id=99473&action=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 #3 from Lucas Stach <dev@lynxeye.de> ---
Created attachment 99474
  --> https://bugs.freedesktop.org/attachment.cgi?id=99474&action=edit
xrandr before failure

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

[bugzilla-daemon]

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

--- Comment #4 from Lucas Stach <dev@lynxeye.de> ---
Created attachment 99475
  --> https://bugs.freedesktop.org/attachment.cgi?id=99475&action=edit
xrandr after failure

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

[bugzilla-daemon]

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

--- Comment #5 from Lucas Stach <dev@lynxeye.de> ---
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

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

--- Comment #6 from Lucas Stach <dev@lynxeye.de> ---
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

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

Lucas Stach <dev@lynxeye.de> changed:

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

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