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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #6 from Lucas Stach <dev at 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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