Thanks. Looks like this is also a kernel bug...
** Summary changed:
- resolution not listed in xrandr from ASUS ROG PG278QR via HDMI
+ [modeset][i915] Native resolution (EDID detailed mode) of 2560x1440 not
listed, defaults to 1920x1080 instead
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1901470
Title:
[modeset][i915] Native resolution (EDID detailed mode) of 2560x1440
not listed, defaults to 1920x1080 instead
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