As the drivers often failed to work with modern kernels and X Servers, they were abandoned by some of the distribution developers – which is why some US15W devices shipped with Dell's Ubuntu don't work particularly well with current Ubuntu releases. Furthermore, Intel didn't offer the drivers as free downloads and only made them available with individual distributions or after completing a registration form. Linux drivers for PowerVR have been available for a while, but they are partially proprietary. As a consequence it therefore has not much in common with the graphics cores used in the Intel notebook and desktop chip sets that are well-supported by open source drivers. The reason for the driver complications is the Poulsbo's and its successors' use of a PowerVR graphics core, which Intel bought as an IP core from Imagination Technologies. However, the US15W was also used in various older notebooks and has a bad reputation in Linux circles due to its rather tricky driver situation. The GMA500 is incorporated in the US15W chip set, also known as Poulsbo, that was developed by Intel for the embedded world. On the Linux Kernel Mailing List (LKML), long-standing Intel employee and kernel developer Alan Cox has presented a rudimentary KMS graphics driver for the GMA500 graphics core.
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