Xorg on AMD geode LX800

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has anyone accomplished to run the xorg X-server on the AMD embedded lx800
board (geode processor) with a resolution of 320x240 pixel?

I am running linux- and xorg 6.8.2, both patched with the patches
from http://makeashorterlink.com/?J25A42ABC

The system is working fine except of the display output:

The display is a Sharp TFT flat panel with a resolution of 320x240 pixel.
(http://www.sharpsma.com/part.php?PartID48%17 )

I can run the X server in 640x480 mode, which does not fit on the display,
so I get some distorted X screen.

I have used the sample xorg.conf included in the above patch archive but
also tried to calculate my own modelines using some of the modeline
calculators available on the internet.

The xorg.conf config file contains the following entries:

Section "Device"
        Identifier      "AMD LX800 onboard video card"
        Driver          "amd"
        BusID           "PCI:0:1:1"
        Option          "FlatPanel"
        Option          "NoCrtEnable"
#       Option          "FPDestGeom"    "320x240"
Section "Screen"
        Identifier      "Default Screen"
        Device          "AMD LX800 onboard video card"
        Monitor         "Generic Monitor"
        DefaultDepth    24
        SubSection "Display"
                Depth           24
                Modes           "320x240"

The 320x240 modes do not work and lead to the following output in the
(II) AMD(0): Not using default mode "320x240" (bad mode
(II) AMD(0): Not using mode "320x240" (no mode of this name)

The option Option "FPDestGeom" "320x240"
leads to the error messages:
FP_DEST_GEOM "320x240" out of range
FP_DEST_GEOM "320x240" not recognized

I would be very pleased, if someone can help me to find a
solution in this case.

best regards,

Re: Xorg on AMD geode LX800
Quoted text here. Click to load it

I finally got it running.

But it works only with one specific configuration:
Color depth: 16, Mode 320x480, Virtual resolution 800x600.
and the option "ShadowFB" enabled.

It is very strange: if I change any of those settings (color depth, mode),
the screen gets distorted.
If I drop the option "ShadowFB", artefacts of windows are left on the screen
when I move a window.

And another nasty fact is that the X-server uses 100% of my CPU time. Do you
know how the acceleration works for that chip?

Section "Device"
    Identifier  "AMD LX800 onboard video card"
    Driver      "amd"
    BusID       "PCI:0:1:1"

    Option      "FlatPanel"
    Option      "NoCrtEnable"
#   Option      "FPDestGeom"    "320x240"
    Option      "Accel"
    Option      "ShadowFB"

Section "Screen"
    Identifier  "Default Screen"
    Device      "AMD LX800 onboard video card"
    Monitor     "Generic Monitor"

    DefaultDepth    16
    SubSection "Display"
        Depth       16
        Modes       "320x480"
        Virtual     800 600

best regards,

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