Quote Originally Posted by Nille View Post
And KDE und Gnome are not able to store smaller things like which Monitor is the Primary since radeon (KMS) has a different Output ordering..... ( #26459 )
I've put the xrandr commands in /usr/share/config/kdm/Xsetup now.

This is no ideal solution, specially for people like my Ubuntu-using mother who has no idea what operating system she has on her computer, but it.. works.