The Chips and Technologies ct655xx range of chips are primarily
manufactured for use in laptop computers, where their power
conservation circuitry is of importance. They can however be found in
a few "Green
" video cards for desktop machines. Prior to
the release of XFree 3.2, XFree contained only limited support for
these chipsets. The support that was introduced in XFree3.1.1 was not
capable of linear addressing or using the programmable clocks in the
ct65540 and later chips.
Support for the ct655xx has been almost completely rewritten, with many additional features added. These include
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