This is what I did.
I went to
http://www.ati.com -> Drivers and Software -> Linux -> FireGL -> FireGL X1-256p
and downloaded the driver.
As root in a console i typed rpm -Uhv fglrx-glc22-4.3.0-2... rpm (the file may have a higher version number by now so please adjust)
Next step was to edit the /etc/X11/XF86Config-4 file to set the screen resolution to something higher than 640*480.
********************* This is the section where I added 1280*1024 ******
Section "Screen"
Identifier "Screen0"
Device "ATI Graphics Adapter"
Monitor "Monitor0"
DefaultDepth 24
#Option "backingstore"
Subsection "Display"
Depth 24
Modes "1280x1024" <-- change here !!!
ViewPort 0 0 # initial origin if mode is smaller than desktop
# Virtual 1280 1024
EndSubsection
EndSection
**********************************************************************************
Then i logged out and restarted the Xserver by doing a CTRL-ALT-BACKSPACE
Voila, it should work now.
B0mbtruck