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SubjectRe: nvidia fb 0.9.0 (0.9.2?)

Louis Garcia <louisg00@bellsouth.net> wrote:

> I gave upgraded to 2.4.2pre on my RH7 box and while using riva-128 fb
> noticed when in X all the white parts of my desktop are to dark, it is
> almost unreadable. I think it might have to do with video timing, is
> there a way to fix this?

Hi!

Color handling on Riva 128 in 8bpp mode is a little bit confused.
The table below summarizes the depth of color registers in 8bpp mode:

| Riva 128 | Riva TNT and higher
----------------+----------+--------------------
XF86 | 6 bit | 8 bit
----------------+----------+--------------------
rivafb < 0.7.2 | 6 bit | 6 bit 'dark console'
----------------+----------+--------------------
rivafb 0.7.3 | 6 bit | 8 bit
----------------+----------+--------------------
rivafb 0.9.2 | 8 bit | 8 bit
----------------+----------+--------------------

The Riva hardware can be programmed to expect 8 bit or 6 bit color
registers. Rivafb < 0.7.2 used 6 bit color registers, but the hw was
programmed to 8 bit registers on TNT/TNT2. That was causing the so
called 'dark console' bug.
Rivafb 0.9.2 begins to utilize 8 bits on Riva 128, but your X server
uses only 6 bits of them so your desktop's brightness is 1/4. Now
Riva 128 has a 'dark X' bug. :)
The X server should be patched. Which X server/version are you using?

Regards:
Ferenc Bakonyi

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