Comment # 1
on bug 110631
from Ilia Mirkin
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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