Yes, it usually shows more modes, notably with some duplicates (different 
refresh rates, perhaps)?
it basically looks like the modes.txt i already posted except also with this at 
the top:

/sys/class/drm/card0-DP-2/modes:2560x1080
/sys/class/drm/card0-DP-2/modes:2560x1080
/sys/class/drm/card0-DP-2/modes:2560x1080
/sys/class/drm/card0-DP-2/modes:1920x1080
/sys/class/drm/card0-DP-2/modes:1920x1080
/sys/class/drm/card0-DP-2/modes:1920x1080
/sys/class/drm/card0-DP-2/modes:1920x1080
/sys/class/drm/card0-DP-2/modes:1920x1080
/sys/class/drm/card0-DP-2/modes:1680x1050

Anyway, I wanted to comment that I was able to reproduce this bug on a
fresh install of CentOS 8 on the same laptop, albeit only once and after
waking the computer from suspend, instead of during boot. I did the same
command to dump all the modes to a text file and saw the results were
the same after waking that install from suspend. So, i'm assuming it's
not a Ubuntu problem, instead it's either a hardware issue as you
suggested it could be, or a Wayland issue - since this CentOS 8 install
is also using Wayland to log in.

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https://bugs.launchpad.net/bugs/1859071

Title:
  Native mode 2560x1080 is randomly unavailable on some boots

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