ACPI v6.1 spec has been released, apparently. I have yet to read it, so not sure what has changed yet. http://uefi.org/acpi The UEFI Forum has already started doing EDK-II trunk checkins for 6.1 support for UEFI. [edk2] [patch] MdePkg: Add ACPI6.1 definition. Add ACPI 6.1 definitions from the ACPI Specification Revision 6.1 January, 2016. MdePkg/Include/IndustryStandard/Acpi61.h … Continue reading ACPI 6.1 released