Re: Color depth issues (was Re: XF4 binaries, ...)
Michael Schmitz wrote:
>
> > > There's some strangeness with XF4 I'd like to see if you can figure out.
> > > If
> > > I start X in 16-bit depth, everything is very, very green. But if I
> > > start in
> > > 15-bit, it's fine. I think 24-bit is ok, too. Do you know why this might
> > > be?
> >
> > Me guesses that these are issues with the kernel frame-buffer that the
> > driver is still using. Michel and Ani might have more information on this.
> > The Mach64 driver has the same issues right now.
>
> 16 bit depth is unversally broken at least whenever the fbdevhw driver is
> used.
It works fine with the glint driver and pm2fb.
> Part of the problem seems to be that the kernel driver is only passed the
> pixel size (bits_per_pixel) which is 16 for both 15 and 16 bit depth.
> The fb_var struct doen't have a separate field for depth.
Right. Geert explained to me that the depth is encoded in the fb_bitfields for
red, green, blue and transparency.
> But that's not all - I've tried a variety of hacks to make the kernel driver
> use the 16 bit depth to no avail. Some part of the X server appears to use
> the wrong depth ...
Please elaborate what you have tried.
Michel
--
Earthling Michel Dänzer (MrCooper) \ CS student and free software enthusiast
Debian GNU/Linux (powerpc,i386) user \ member of XFree86 and The DRI Project
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