Open-source developers for a while have been working on ACPI 6 support for Linux with 64-bit ARM support, ACPI 6 NV-DIMM support, and other functionality. With the Linux 4.2 kernel that's now in-development, more ACPI 6 code will be landing...
June 23, 2015
Linux 4.2 Power Management Update Yields More ACPI 6 Changes
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