[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

--- Comment #31 from Claude Heiland-Allen (claude at mathr.co.uk) ---
Created attachment 282101
  --> https://bugzilla.kernel.org/attachment.cgi?id=282101&action=edit
dmesg logs after booting to X with displays connected to both DVI and HDMI

Good news: the bug only seems to affect the DVI output from my card.

I managed to connect another screen via an HDMI port and it works ok with
amdgpu=1 (both screens have kernel messages mirrored until about 5 seconds into
boot, when the DVI screen turns off - the HDMI screen stays on and I can log
into X).

Attached are 7 dmesg logs, with amdgpu=1 unless specified.

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