I have realized, that my issue is not related to GDM, rather with X detection of my monitor. But it should be related to libxrandr (if I understand it well).
-- [Hardy] GDM starts with wrong display resolution https://bugs.launchpad.net/bugs/194552 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug assignee. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs