Intel has put great effort to put complete open-source drivers into recent kernels for its devices. Only device that is clearly missing there is GMA500 (aka Poulsbo, aka US15 chipset, aka Atom Z5xx family). This is understood as it does relay on Imagination Technologies PowerVR core licensed out by Intel to produce GMA500, so most of the driver parts cannot go open-source as it would imply of violation of some agreement between ImgTec and Intel.
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