Draft: backends/drm: Generate display modes for other refresh rates
Make KWin generate default display modes for refresh rates other than 60 Hz. Some laptop displays (mine, in particular) reject all resolutions at 60 Hz, but do accept them at other refresh rates (90 Hz in my case).
GNOME also generates a lot more modes by default, see https://gitlab.gnome.org/GNOME/mutter/-/blob/main/src/backends/native/gen-default-modes.py.
Context: CCBUG: 496721
Edited by Timo Velten