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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 sup-
port 8, 15, 16 and 24. Some also support 1 and/or 4, and some
may support other values (like 30). Note: depth means the num-
ber 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.
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