[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

Sergey Kondakov (virtuousfox at gmail.com) changed:

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                 CC|                            |virtuousfox at gmail.com

--- Comment #33 from Sergey Kondakov (virtuousfox at gmail.com) ---
This probably has reports from multiple separate bugs resulting in loss of
output. It's easy to mix up with other bugs if you have only one monitor and
your system is silently stuck on invisible login screen or if entire driver
failed.

In my particular case, it's triggered by UEFI boot mode: when amdgpu is loaded
it shuts down the output port that was used by UEFI BIOS during the boot, so I
stuck with my secondary monitor only. It behaves as if monitor was yanked out
the port. Reconnecting it physically does nothing. It works fine if CSM is used
in motherboard but my new MB forces full UEFI, so I'm stuck with that.

Does anyone get "[drm] Cannot find any crtc or sizes" with multiple monitors ?

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