Int 15 Fn 530F  - Advanced Power Management V1.1+ - Engage/disengage Powe  [p]

   AX = 530Fh
   BX = device ID (see #0400)
   CX = function
       0000h disengage power management
       0001h engage power management

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

Notes: unlike AX=5308h, this call does not affect the functioning of the APM
     BIOS
   when cooperative power management is disengaged, the APM BIOS performs
     automatic power management of the system or device

See Also: AX=5308h,AX=530Dh