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ACPI emulation, and what version of the specification to follow.

WARNING:
This option is very experimental at this time and should not be enabled unless you're willing to accept the consequences.
Intended for use with ACPI-aware OSes including Linux and Windows 98/ME.
This option will also slightly reduce available system memory to make room for the ACPI tables, just as real BIOSes do, and reserve an IRQ for ACPI functions.

Possible values: off, 1.0, 1.0b, 2.0, 2.0a, 2.0b, 2.0c, 3.0, 3.0a, 3.0b, 4.0, 4.0a, 5.0, 5.0a, 6.0.
