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

[bugzilla-daemon at bugzilla.kernel.org]

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

babgozd (babgozdtb at outlook.com) changed:

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                 CC|                            |babgozdtb at outlook.com

--- Comment #38 from babgozd (babgozdtb at outlook.com) ---
(In reply to Adam from comment #37)
> 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?
I am following this thread since it has created. My R9 380 with DVI-I output is
connected to my VGA monitor with DVI-I male to VGA female adapter and I am
getting black/blank screen while booting with amdgpu.dc=1 which is default
since kernel 4.17. It is fine with amdgpu.dc=0. I can provide logs too if any
kernel contributor wants to investigate the problem any further.

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