[Nouveau] [Bug 110631] EDID confusion with LG 4K TV as monitor running X rather than wayland

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110631

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
FWIW I have a LG C7P which I tested with a GM206 and GP107. Slightly different
than your setup, but comparable.

I used this setup for bringup of HDMI 2.0 support, available in kernel 4.20.
HDMI 2.0 is required for 4k at 60 over HDMI.

Looking at those logs, you appear to be using modeset instead of
xf86-video-nouveau (note how it says "modeset" instead of "NOUVEAU"). The logs
make it look like modeset is trying to use a 3840x2160 594MHz mode. This
requires HDMI 2.0 to work (and should have been filtered out, but nonetheless
is the modeline presented).

I'd recommend (a) using xf86-video-nouveau [RH has made local changes to this
driver to not load, but I believe this to be a very bad idea, you can override
with an xorg.conf iirc], and (b) updating to a 4.20+ kernel so that you get
HDMI 2.0 to work to get access to the higher refresh rates.

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