Int 15 Fn 5308  - Advanced Power Management V1.0+ - Enable/disable Power   [p]

   AX = 5308h
   BX = device ID for all devices power-managed by APM
       0001h (APM v1.1+)
       FFFFh (APM v1.0)
   CX = new state
       0000h disabled
       0001h enabled

Return: CF clear if successful
   CF set on error
       AH = error code (01h,03h,09h,0Ah,0Bh) (see #0399)

Notes: when power management is disabled, the system BIOS will not
     automatically power down devices, enter stand-by or suspended mode,
     or perform any power-saving actions in response to AX=5305h calls
   should not be called from within a hardware interrupt handler to avoid
     reentrance problems
   the APM BIOS should never be both disabled and disengaged at the same
     time

See Also: AX=5309h,AX=530Dh,AX=530Fh