Int 15 Fn 5313  - Advanced Power Management V1.2 - Enable/disable Timer-b  [p]

   AX = 5313h
   BX = device ID (see #0400)
       0000h (APM BIOS)
       other reserved
   CL = function
       00h disable timer-based requests
       01h enable timer-based requests
       02h get timer-based requests status

Return: CF clear if successful
       CX = timer-based requests status (0000h disabled, 0001h enabled)
   CF set on error
       AH = error code (03h,09h,0Ah,0Bh,86h) (see #0399)

Notes: this function is supported via the INT 15, 16-bit protected mode, and
     32-bit protected mode interfaces

See Also: AX=5300h,AX=5310h,AX=5311h,AX=5312h