Int 2F Fn 5403  U - Power.exe - Get/set Advanced Power Management Setting  [p]

   AX = 5403h
   BX = new power management setting or 0000h to get current setting

Return: AX = status
       0000h successful
       BX = power management setting (see #2525)
       other error code

See Also: AX=5401h,AX=5480h

(Table 2525)
Values for power management setting:
 0001h-0005h "min"
 0006h      "reg"
 0007h-0008h "max"