I tried the workaround proposed by thw-th. It works, but only for the first login. That means the screen configuration is wrong
- on the login screen (gdm)
- after locking the screen and unlocking it again
With lightdm, the login screen works like a charm but the desktop is affected by the screen config issue right after logging in, when the above workaround is not installed.
So, yes, seems like a GNOME issue. Not the only one, I'd like to add.
I tried the workaround proposed by thw-th. It works, but only for the first login. That means the screen configuration is wrong
- on the login screen (gdm)
- after locking the screen and unlocking it again
With lightdm, the login screen works like a charm but the desktop is affected by the screen config issue right after logging in, when the above workaround is not installed.
So, yes, seems like a GNOME issue. Not the only one, I'd like to add.