I'm guessing a common cause of this bug is low quality HDMI cables. If
you're stuck at 1080p then that suggests the cable is only HDMI 1.2. To
achieve 1440p at 60Hz you will need an HDMI 1.4 cable. And to achieve
2160p (4K) at 60Hz you will need an HDMI 2.0 cable AND a modern GPU to
plug it into. 3K and 5K requirements are somewhere in the middle
depending on the vertical resolution of the monitor.

https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video

If you're shopping for a new monitor then it's best to find one with
DisplayPort (or USB-C) which doesn't have quite as severe limitations as
HDMI does.

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https://bugs.launchpad.net/bugs/1901470

Title:
  [i915] HDMI monitor's native resolution (EDID detailed mode) not
  available, defaults to 1080p instead

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