You could select the monitor in Sax2 and add a higher resolution.
Or you could use the "gtf" program to generate your own modeline.
gtf <vertical res> <horizontal res> <refresh rate> -x
Edit out the ".00" in the label after the refresh frequency. Look in the Monitor section corresponding to this monitor. There probably is a: Use "Modes[0]" or Use "Modes[1]" line. If so, then insert your generated Modeline in the corresponding Modes section. In the Screen section for this monitor, add your Modeline label in the Modes line for each resolution.
Code:
Section "Modes"
Identifier "Modes[0]"
EndSection
Section "Monitor"
Identifier "Monitor[0]"
VendorName "HP"
ModelName "ZV5000"
UseModes "Modes[0]"
DisplaySizpe 332 207
HorizSync 32.0 - 48.0
VertRefresh 40.0 - 70.0
Option "CalcAlgorithm" "XServerPool"
Option "DPMS"
EndSection
With just one monitor, you may just have "Modes[0]". The UseModes line will tell you which one to use.
Don't simply copy my values in the monitor section. It is for a 1280x800 laptop lcd display. Before SaX2 had an entry for ZV5000, I would have to generate my own modeline with "gtf 1280 800 60 -x".
Here is where you would enter the Modeline labels:
Code:
Section "Screen"
Identifier "Screen[0]"
Device "Device[0]"
Monitor "Monitor[0]"
DefaultDepth 24
Option "AllowGLXWithComposite" "True"
Option "RenderAccel" "True"
Option "AddARGBGLXVisuals" "True"
SubSection "Display"
Depth 15
Modes "1280x800" "1280x768" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x800" "1280x768" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x800" "1280x768" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 32
Modes "1280x800" "1280x768" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x800" "1280x768" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "Disable"
EndSection
I don't know if you want 1280x800 or 1280x1024. This example uses "1280x800". Again, don't use a label like "1280x800@60.00". Change it to "1280x800" or "1280x800@60". The latter form may be useful if you generate a Modelines for different refresh rates.
You could simply add "1280x800" (or "1280x1024") to the Modes and see if xorg can perform the modeline calculation automatically when you start up.