ACPI 4.0 - Done/Doing

Jun-10: Linux-2.6.30: x2apic
Jun-16: ACPI 4.0 spec published
Sep-9: Linux-2.6.31: ACPICA core 20090521 w/ ACPI 4.0 support
TBD: Linux-2.6.32: power meter; forced processor idling
TBD: Linux-2.6.33: Error Reporting; IPMI op-region