David Laight wrote:
> 
> Interesting...  I'd guess that the 'wrap' is displayed because the
> panel is ignoring the 'frame' signal because it isn't ready for it.
> So probably the refresh rate it 1/2 the expected value.  This sort
> of implies that the DMA is taking data from the wong place!  But
> terminating at the correct one!!
> 
> So it doesn't look like a simple error in the config wrt the number
> of blank lines required at the top of the screen (because the missing
> data would (more or less) appear at the bottom.
> 
> Getting near time to consider what the HW spec says!
> 
> What is the display resolution? and colour depth?
> 
> 10% of 640x480 is about 32k.....
> I wonder if the chipset has some way of reading a colour pallete from
> the start of the display buffer, it isn't unheard of...
> 

It looks like it's trying to come up in 800x600 with 16bit colour depth.
That's what I was hoping for anyway. The XFree 4 configuration file is
much terser than the old version 3 one, and I'm not sure how X
determines the available resolutions. Does X probe the capabilities of
the hardware, and select the best resolution and depth? Or does it
automagically work out what the display should support from the minimal
data in the XFree config file?

It would be nice if I could work out the exact species of C&T chipset
the laptop has, but the HP/Compaq/Digital site hasn't got the manual for
this particuar machine - just a PDF that when you download it says "Not
done Yet". Is there any way of probing it? I can't open the machine up,
as it's in a pretty inaccessible metal case (typical Digital over
engineering!).

Chris
-- 
chris.wareham@iosystems.co.uk (work)
chris.wareham@btopenworld.com (home)