This could be down to your monitor lying about what it can actually do or incorrect settings in xorg.conf ...
Timo, Gordo, Marcel: Could you each attach your /var/log/Xorg.0.log and /etc/X11/xorg.conf files to this bug report?
This could be down to your monitor lying about what it can actually do or incorrect settings in xorg.conf ...
Timo, Gordo, Marcel:
Could you each attach your
/var/log/Xorg.0.log
and
/etc/X11/xorg.conf
files to this bug report?