Hi,

I made a patch to incorporate the latest ACPI CA of intel
to -current and made an ad hoc patch to shutdown
(migrate to S5 at shutdown).

If you are interested, please check at http://snipers.mine.nu/netbsd/

BTW, the driver is disabled via doshutdown() interface before
the very last minute.  It may be a problem at powering off.

AcpiOsSleep()@Osd/OsdSchedule.c is called after disabling
interrupts.  Can we rely on tsleep() in such situation?