mono, gray and index configs

When filling in a fb_var_screeninfo how do I ask for mono, gray and
index configs? Is is always request length red and green/blue length =
zero to indicate a mono, gray or index config? Then grayscale is used
to differentiate gray/mono from indexed?

Are there any more tricks to asking for a config? One trick I see is
if bpp is set to a value where the hardware only supports one format
at that bpp, ignore rbgt and set the config.

-- 
Jon Smirl
jonsmirl@gmail.com


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