[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 #14 from Coleman Kane (ckane at colemankane.org) ---
So diving a bit further it looks like a contributor to this behavior might be
my misbehaving video hardware.

After some reading I did determine that I can add the following to my linux
command line in GRUB and Xorg will recognize the video mode, as well as all the
other video modes supported by the monitor:
video=DP-1:3840x2160 at 29.97me

So I think at this point, I have a solution that will address the problem for
me. I am not certain whether you think it would make sense to modify the code
to account for this situation or not. The old behavior was still able to get
the video modes from the display despite it coming up "inactive" on boot, but
it seems like the new behavior causes it to throw away all the video modes and
substitute them with some basic SVGA modes.

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