[Bug 208947] amdgpu DisplayPort won't recognize all display modes after 5.9 merges

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=208947

--- Comment #13 from Coleman Kane (ckane at colemankane.org) ---
Interestingly enough, the description of a problem attempting to be addressed
with this fix sounds similar to behavior I experience with this system:

Namely, the Radeon RX 580M connected over DisplayPort advertises 3840x2160 at 60Hz
but I've never gotten the card to successfully link up to the monitor at that
resolution. In console mode, this results in the "black screen" where only the
built-in display for the laptop works and the external monitor just stays black
(falls asleep). In Xorg, if I set it to 3840x2160 at 29.97Hz, it works however.
Additionally, setting the higher resolutions can take a noticeable moment to
display.

I have another laptop with another graphics card and was able to test that the
display does work at 3840x2160 at 60Hz.

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