Significant ACPI & Power Management Changes In Linux 3.19

Of interest to most Phoronix readers is that the Intel P-State driver now supports hardware P-States. This Intel CPU scaling driver for modern CPUs now uses CPUID to check whether a feature is supported by the processor, when enabling features by default.
The ACPI/PM changes also have a unified interface for accessiing device properties provided by platform firmware, support for a platform firmware interface based on ACPI regions used in PMIC chips on Bay Trail hardware, ACPI core improvements, and a CPUfreq driver for the Loongson 1B processor.
The full write-up on what these power related changes mean for the Linux 3.19 kernel can be found via the 3.19 merge window pull request.
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