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 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1888800 Title: Resolution of external monitor goes back to its default resolution when laptop lid is closed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1888800/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs