1 Introduction

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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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