I have experienced the same resolution fallback weirdness with multiple
devices over the years. In all cases the problem was either a poor
quality HDMI cable or a poor quality connection at one end of the cable.
Please try unplugging both ends of the cable/adapter and check them for
dirt or bent pins. Plug everything back in firmly and try again. If the
problem persists then you should try a new HDMI cable and DP adapter.
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1650900
Title:
UHD TV resolution changed unintendly to FHD
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