Description of problem: Stuck on 800x600

01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter (rev 10)
Version-Release number of selected component (if applicable):
xorg-x11-drv-sis-0.10.2-1.fc12.x86_64
$ xrandr
Screen 0: minimum 640 x 480, current 800 x 600, maximum 800 x 600
default connected 800x600+0+0 0mm x 0mm
   800x600        61.0* 
   640x480        60.0  

How reproducible: Always


Steps to Reproduce:
1.Have sis graphics
2.
3.
  
Actual results: Stuck on small display 800x600


Expected results: 1024x768 at least


Additional info: This my daughters Laptop, it may take a couple of days to get any needinfo sorted. The F11*sis was the same, thought thr Rawhide driver might improve it.