Int 15 Fn 5307  - Advanced Power Management V1.0+ - Suspend System         [p]

   AX = 5307h
   CX = 0002h
   BX = 0001h (device ID for all power-managed devices)

Return: after system is resumed
   CF clear

Notes: puts the entire system into a low-power suspended state; normally
     called in response to a Suspend System Request notification after
     any necessary processing, but may also be invoked at the caller's
     discretion
   should not be called from within a hardware interrupt handler to avoid
     reentrance problems
   the caller may need to update its date and time values because the
     system could have been suspended for a long period of time

See Also: AX=5307h/CX=0001h"STAND-BY",AX=530Bh