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PCI VGA Palette Snoop
The VGA "palette" is the set of colors that are in use by the video card when it is in 256-color mode. Since there are thousands of colors and only 256 can be used in that mode, a palette containing the current colors is used. Some special VGA cards, high-end hardware MPEG decoders etc. need to be able to look at the video card's VGA palette to determine what colors are currently in use. Enabling this feature turns on this palette "snoop".
This option is only very rarely needed. It should be left at "Disabled" unless a video device specifically requires the setting enabled upon installation.
Next: Power Management