Int 15 Fn 5309  - Advanced Power Management Specification - Restore Power  [p]

   AX = 5309h
   BX = FFFFh

Return: CF clear if successful
   CF set on error
       AH = error code (09h) (see AX=5300h)

Note:  should not be called from within a hardware interrupt handler to avoid
     reentrance problems

See Also: AX=5308h