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

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