Hello !. I don't have the same card as you do but I think that you should be able to solve the trouble doing this :
1 - Open you xorg.conf file
2 - Go to the screen section. You should see something like this :
Section "Screen"
Identifier "Default Screen"
Device "Silicon Integrated Systems (SiS) 86C326 5598/6326"
Monitor "Monitor genérico"
DefaultDepth 24
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
3 - Change the resolution. Example : If I have this :
SubSection "Display"
Depth 24
Modes "640x400"
EndSubSection
it means that I'm able to use a resolution of 640x400 in 24 bpp depth, if I want to change to other then you can remove the current resolution or add new ones. Example :
SubSection "Display"
Depth 24
Modes "640x400" "800x600"
EndSubSection
Here I only added the 800x600 reolution. If you only want 800x600, then
SubSection "Display"
Depth 24
Modes "800x600"
EndSubSection
Don't forget to change the modes for other depths and that the key combination ctrl+alt+plus switches to greater resolution and ctrl+alt+minus switches to a lower resolutions. Hoped I helped in one or another way.
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