Screen Resolution

[Stephen Eastman <stephen_eastman%yahoo.com@localhost>]

I am trying to get to a screen resolution of 1024x768 on my Sun sparc ultra5.  
Currently I am at 800x600.  I tried xrandr -s 1024x768 and got "Size 1024x768 
not found in available modes"

Here is the relevant section from my xorg.conf

   Identifier  "Card0"
        Driver      "mach64"
        VendorName  "ATI Technologies Inc"
        BoardName   "3D Rage Pro 215GP"   
        BusID       "PCI:0:0:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Card0"  
        Monitor    "Monitor0"
        SubSection "Display" 
                Viewport   0 0
                Depth     1   
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     4   
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     8   
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     15  
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     16  
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24  
        EndSubSection
EndSection

I am certain that Sun would never make a machine with less than 1024x768
so I am hoping I can get this up there. Thanks,

stephen