On Sat, 26 Oct 2002, Holger Isenberg wrote:
> Ok, I checked again with starting the server in 16bpp mode where
> 32 of the 64 graylevels looked greenish as described.
> However, in 24bpp there are still these 64 graylevels, but all really gray.
> I also tried the GATOS ATI.2 radeon/r128 module with same result.
>
> So it seems, that the DAC is set into 6bit per channel mode, and displayed
> wrong as:
> (==) RADEON(0): RGB weight 888
> (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
You guys are likely misinterpreting what you are seeing. Most
digital flat panels are only 6 bits per component! It's not
the video card that's truncating the data, but the flat panel.
Many video cards have an option to dither 8 down to 6 before the
flat panel truncates it. I just added such an option to the "nv"
driver recently ("FPDither"). It was my impression that only
the really expensive panels are 8 bit, and that pretty much all
of the laptop panels are only 6 bit.
MArk.
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