https://bugs.freedesktop.org/show_bug.cgi?id=110631
--- Comment #1 from Ilia Mirkin <imir...@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@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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