[armedslack] kernel patches

[Alan Hourihane]

On Thu, 2007-08-02 at 09:41 +0100, Stuart Winter wrote:
> > The 24bpp support is bogus. It does exactly what 32bpp support is. Is
> > there a problem with starting X without this ??
> 
> It was to do with resolution and colours:
> 
> "
> > I can get the RiscPC to display in 1280x1024 at 60Hz but only in 8bpp.
> > I can get it to display at 800x600 in 16bpp but that's it :-(
> > The machine has 2MB of VRAM so it should be able to display 1024x768
> > in 16bpp at least (I think!).
> 
> You are definitely right. You can try it with the program fbset in the
> console. Presently it seems that there are 2 problems:
> 
> (1) The VIDC20 framebuffer driver needs also to accept 24bpp as a request
> for
> 32bpp due to a change in the X server. So 24bpp can not work currently.
> 
> (2) Another problem is the screen mode enumeration of Xorg. Maybe it
> checks
> first mode 800x600-{anything above 56), sees that this doesn't work, and
> concludes that all 800x600 modes are not possible. If I have time I will
> try
> to fix it. IIRC, you can overcome the problem by specifying your own modes
> in
> xorg.conf, they are tested first then. It should help to include these
> lines
> into xorg.conf:
> 
> Section "Modes"
>         Identifier "Whatever"
>         Modeline "800x600" 36.0 800 824 896 1024  600 601 603 625 +hsync
> +vsync
>         ModeLine "1024x768" 75.0 1024 1048 1184 1328  768 771 777 806
> -hsync -vsync
> EndSection
> .
> .
> .
> Section "Monitor"
> .
> .
> .
>         UseModes "Whatever"
> EndSection
> 
> But as I said, 24bpp can not work currently."

Still seems bogus.

You can start X with the the -fbbpp flag or modify the xorg.conf file to
start X at 32bpp.

I'll load X up on my RiscPC and try it out.

Stuart - do you want to send the INTERLACED/DOUBLESCAN part off to
Russell's bug tracker ??

Alan.