Thanks. That looks like a bug in the mutter code, which provides the graphics back-end.
Please log the bug here: https://gitlab.gnome.org/GNOME/mutter/issues and then tell us the ID of the newly-created bug. ** Summary changed: - gdm with a ultra wide monitor it's soo bad + GDM horizontal scanline corruption with an ultra wide monitor ** Changed in: gdm3 (Ubuntu) Status: Incomplete => New ** Tags added: visual-quality ** Also affects: mutter (Ubuntu) Importance: Undecided Status: New ** Changed in: mutter (Ubuntu) Status: New => Incomplete ** Changed in: gdm3 (Ubuntu) Status: New => Incomplete ** Changed in: gdm3 (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1748871 Title: GDM horizontal scanline corruption with an ultra wide monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1748871/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs