Some coworkers decided to install Debian on a PC with a ViewSonic G800 monitor and a ATI Technologies Inc Rage XL graphic card, but the best resolution they could get was 800×600. After checking out the X serverr’s drivers, which were installed correctly for the ATI card, and try some drivers variants (r128, radeon,k etc), I asked the monitor’s settings to the person who installed the system, and he said he didn’t know them or the manual’s whereabouts. By searching on the net I came across with the manual in the manufacturer’s web page, of particular interest is the table with the refresh parameters:
With this information I proceeded to created the X server configuration file, I mean, the /etc/X11/xorg.conffile:
Section "Device" Identifier "Configured Video Device" Driver "ati" EndSection Section "Monitor" Identifier "Configured Monitor" HorizSync 60.02 VertRefresh 75 EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" EndSection
The monitor’s manual can be downloaded on the manufacturer’s web page, but you must enter the monitor code. If you don’t have it, here you have the manual in PDF.
Reference: man ati