32 and 24 bpp have the same color resolution (only 24 bits). If what you are seeing is banding, it's probably a driver issue. Laptop panels typically only have 18 bits of color resolution and this becomes visible if the graphics hardware isn't dithering from 24 => 18 bits. At least in the case of the "nv" driver for NVIDIA chips, there is an Option "FPDither" to turn that on. I don't know if other drivers support such options.
Speaking of the "option": I mean it's ok that such an option exists (for what reason ever), but is there any good reason for not enabling dithering by default if the panel is detected as being of 18bit type and the colordepth is 24?
Thomas
-- Thomas Winischhofer Vienna/Austria thomas AT winischhofer DOT net http://www.winischhofer.net/ twini AT xfree86 DOT org
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