libXxf86vm provides an interface to the XFree86-VidModeExtension
extension, which allows client applications to get and set video mode
timings in extensive detail. It is used by the xvidtune program in
particular.
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More information about X.Org can be found at:
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This module can be found at
git://anongit.freedesktop.org/git/xorg/lib/libXxf86vm