Some days ago I tried to run X with 32k colours. I used
setdisplay -x 800 -y 600 -f 63 -c 16 (I have only 1 MB VRam) This video mode
runs happily under RiscOS. The MDF is the same as under RiscOS. I started X
right after setdisplay.

But I only got rubbish to see, even when I decreased resolution to 640*480.

When I used 640*480*32k, I got the following to see on the screen:


 ##### 320 pixel #########   ################ 320 pixel ####################
 ---------------------------------------------------------------------------
| 1st half of 1st line     '  colour of last pixel of 1st half of 1st line  |
| 2nd half of 1st line     '  colour of last pixel of 2nd half of 1st line  |
| 1st half of 2nd line     '  colour of last pixel of 1st half of 2nd line  |
| 2nd half of 2nd line     '  colour of last pixel of 2nd half of 2nd line  |
.                                                                           .
.                                                                           .
.                                                                           .
| 1st half of 240th line   '  colour of last pixel of 1st half of 240th line|
| 2nd half of 240th line   '  colour of last pixel of 2nd half of 240th line|
 ---------------------------------------------------------------------------

The display was syncing correctly and was stable.

And when using 800*600*32k, it is nearly the same, but the VIDC doesn't seem
to get the right starting point of the line. It often starts some pixels to
late and looks like this: (In RiscOS the video mode works !)

*****************************************
   *****************************************
 *****************************************
  *****************************************

But the colours are always ok. Only in startup screen they are wrong and
show nearly all 32k colours possible.
 
Does anyone know why it doesn't work?


Peter