Please:
1. Try selecting 'Ubuntu on Wayland' from the login screen and tell us
if that has the same bug.
2. Tell us if you are using any fractional scaling settings.
3. Mutter/gnome-shell remembers multiple different display
configurations. So it sounds like it's just switching configurations
when you close the laptop screen (which it might see as disconnected or
turned off). If you want that configuration to use 2560 ⨉ 1440 then you
may need to set that resolution _while_ the laptop lid is closed. I hope
that fixes the issue...
** Tags added: multimonitor
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1888800
Title:
Resolution of external monitor goes back to its default resolution
when laptop lid is closed
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