Le lundi 01 août 2005 à 23:08 +0200, Matthias Boerner a écrit :
> Hi,
>
> also NVIDIA is not working with 32bpp: You will get following error message
> if
> you switch to 32bpp in the section "Screen", SubSection "Display",...:
>
> (II) Setting vga for screen 0.
> (EE) NVIDIA(0): Given color depth (32) is not supported
> (EE) NVIDIA(0): *** Aborting ***
> (II) UnloadModule: "nvidia"
> (EE) Screen(s) found, but none have a usable configuration.
>
>
> The man pages of xorg.conf say at "DISPLAY SUBSECTION":
>
> Depth depth
>
> This entry specifies what colour depth the Display subsection is to be used
> for. This entry is usually specified, but it may be omitted to create a
> match-all Display subsection or when wishing to match only against the FbBpp
> parameter. The range of depth values that are allowed depends on the driver.
> Most driver support 8, 15, 16 and 24. Some also support 1 and/or 4, and some
> may support other values (like 30). Note: depth means the number of bits in a
> pixel that are actually used to determine the pixel colour. 32 is not a valid
> depth value. Most hardware that uses 32 bits per pixel only uses 24 of them
> to hold the colour information, which means that the colour depth is 24, not
> 32.
>
> Matthias
>
Are you confusing both depth and pixel definition:
here an extract from NVIDIA readme
> DEPTH, BITS PER PIXEL, AND PITCH
While not directly a concern when programming modes, the bits used per
pixel
is an issue when considering the maximum programmable resolution; for
this
reason, it is worthwhile to address the confusion surrounding the terms
"depth" and "bits per pixel". Depth is how many bits of data are stored
per
pixel. Supported depths are 8, 15, 16, and 24. Most video hardware,
however,
stores pixel data in sizes of 8, 16, or 32 bits; this is the amount of
memory
allocated per pixel. When you specify your depth, X selects the bits per
pixel
(bpp) size in which to store the data. Below is a table of what bpp is
used
for each possible depth:
Depth BPP
------------------------------- -------------------------------
8 8
15 16
16 16
24 32
>
--
Gerard
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