Why is xorg ignoring the frequencies I give it?

[Miles Lane]

Hi Andy,

I notice your xorg log contains this:
> (EE) GARTInit: Unable to open /dev/agpgart (No such file or directory)
This part looks like an issue with your kernel.  Is there agpgart support
for the i915 chipset?  What kernel are you running?  I am running
2.6.16-rc1 and dmesg says:
agpgart: Detected an Intel 855 Chipset.
agpgart: Detected 32636K stolen memory.
agpgart: AGP aperture is 128M @ 0xe8000000

This issue with agpgart support may be the reason you are getting this:
> (II) I810(0): 37608 kBytes additional video memory is required to
>      enable tiling mode for DRI.
> (II) I810(0): 16100 kBytes additional video memory is required to
>      enable DRI.
> (II) I810(0): Disabling DRI.
This is going to limit your 3D rendering / graphics accelleration, I think.

Since the SDM-S204 is a TFT screen with 1600x1200 pixel screen,
you might want to strip out the lower resolutions.

You might try the following changes to your config file:

Section "Device"
        Identifier      "Intel Corporation Intel Default Card"
        Driver          "i810"
        BusID           "PCI:0:2:0"
EndSection

Section "Monitor"
        Identifier      "SDM-S204"
        Option          "DPMS"
        VertRefresh  57.0 - 85.0
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "Intel Corporation Intel Default Card"
        Monitor         "SDM-S204"
#        DefaultDepth    24
        SubSection "Display"
                Depth           16
                Modes           "1600x1200" "1280x1024"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1600x1200" "1280x1024"
        EndSubSection
EndSection

I hope this helps a bit,
            Miles