I dont know much about suse, but i would fisrt check the moniter section of XF86Config-4 file
if you use xorg i have no idea where it wold be a locate xorg should pull something..
anyway as for XF86Config
Code:
nano /etc/X11/XF86Config-4
or pico, or joe whatever you favorite edit or is
look for something like this
Code:
Section "Monitor"
Identifier "Generic Monitor"
HorizSync 30-55
VertRefresh 50-120
Option "DPMS"
EndSection
thats where you horizontal / vertical settings are
check the manufactures website first if possble to see what settings your moniter has.
you could also try
Code:
dpkg-reconfigure xserver-xfree86
hope that helps