[Bug 200695] Blank screen on RX 580 with amdgpu.dc=1 enabled (no displays detected)

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=200695

--- Comment #37 from Adam (magicmyth@magicmyth.com) ---
As several comments mention different behavior between the different connector
types I found a spare DVI cable and tried connecting to the same monitor via
that input and it worked! So once logged in I plugged in the HDMI cable and
switched input and it worked just fine (monitor was glitchy at first but once I
disabled DVI output in monitor configuration it worked perfectly). To confirm
this was indeed working with the DC code path I tested audio over HDMI and it
worked just fine (and does not work with DC disabled, as expected). So I
rebooted with both the DVI and HDMI in and the output over HDMI worked all
through boot. I then disconnected the DVI and rebooted and the HDMI continues
to work so far. Unfortunately I don't have a displayport monitor around to test
if that behaves as weirdly. Just to be clear, I had tried to make this monitor
work for a couple weeks over HDMI and the only thing that worked was
amdgpu.dc=0 until I plugged in the DVI connector so this was not a one off
fail.

I forgot to mention before that when the HDMI output was not working with DC my
Xorg logs also showed no monitor detected.

I can attach the two different Xorg logs if that helps?

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