The most likely explanation here is that the kernel is not offering 4K
as a supported resolution, which you can check by running:
grep . /sys/class/drm/*/modes
If it's not listed there then you need a higher quality HDMI 2.0 cable.
Or even better to use DisplayPort instead.
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2004613
Title:
Intel UHD Graphics 770 (ADL-S GT1) max res 1920x1080, should be 4K
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