Xorg on AMD geode LX800

Hi,

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-2.6.11.12 and xorg 6.8.2, both patched with the patches from

formatting link

The system is working fine except of the display output:

The display is a Sharp TFT flat panel with a resolution of 320x240 pixel.

formatting link

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" EndSection Section "Screen" Identifier "Default Screen" Device "AMD LX800 onboard video card" Monitor "Generic Monitor" DefaultDepth 24 SubSection "Display" Depth 24 Modes "320x240" EndSubSection EndSection

The 320x240 modes do not work and lead to the following output in the logfile: (II) AMD(0): Not using default mode "320x240" (bad mode clock/interlace/doublescan) (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, Harald.

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" EndSection

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 EndSubSection EndSection

best regards, Harald