From: Nicolai Haehnle <Locinga@pfaffenwinkel.de>
  To  : ggi-develop@eskimo.com
  Date: Wed, 12 Apr 2000 21:24:17 +0200

Re: Riva 128 (Diamond Viper V330 AGP)

Hi!

> When I enable 16 bpp, I get a blue or green font. The colours of fbtv are
> still wrong and remind me of xawtv when used without the 'Weight=555'
> option in XF86Config in the 'Screen' section. According
> /usr/X11/lib/X11/doc/README.NV1, RIVA128 doesn't support 16 bpp, only 15
> bpp. But when I do a

Th chip can do both, but AFAIK acceleration only works with 15bpp.

>
>
>   fbset -fb /dev/fb1 -g 1024 768 1024 768 15
>
> I get an
>
>   ioctl FBIOPUT_VSCREENINFO: Invalid argument
>
> error.
>
> Does anyone know who to enable 15 bpp?
>

I had a quick look at the code: There are lots of switch()-statements
deciding what modes are allowed. One half succeeds on 15bpp AND 16bpp, the
other one only succeeds on 16bpp. So only 16bpp works.


--
cu,             | Windows-User is Indian for
        Nicolai | "white man looking on the blue screen"