Please try:
1. Selecting 'Ubuntu on Wayland' from the login screen. Do you now get
4K modes offered in Settings?
2. Run:
grep . /sys/class/drm/*/modes > kernel-modes.txt
and then attach the resulting text file here.
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed
Yes it looks like either the kernel driver or Xorg driver is failing to
expose 4K modes, which definitely should be available:
EDID version: 1.3
Manufacturer: SAM Model 3988 Serial Number 0
Made in week 41 of 2018
Digital display
Maximum image size: 70 cm x 39 cm
Gamma: 2.20
DPMS levels: Off
RGB
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