Changing Screen Resolution and Refresh Rate

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The RedPost/Kit features an SiS 550 graphics chipset. In order to get this to run at a resolution of 1280x1024 in DSL, it is necessary to install the sisfb framebuffer module to the kernel. 

sudo modprobe sisfb mode=1280x1024x32 rate=75 mem=12288

This is done from the /opt/bootlocal.sh bootscript.

The parameters are as follows:

  • mode: horizontal and vertical pixels, and color depth
  • rate: vertical refresh rate (Hz)
  • mem: RAM to set aside for the framebuffer (Note: In a box with 128MB RAM it is necessary to load DSL with the vga=normal kernel boot parameter so that enough memory will be left for sisfb.)

Reference: Thomas Winischhofer on SiS/XGI graphics chipsets and X.org/XFree86/Linux

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