INT 10 - VESA VBE/PM (Power Management) v1.0+ - GET DISPLAY POWER STATE

	AX = 4F10h
	BL = 02h
Return: AL = 4Fh if function supported
	AH = call status
	    00h successful
	       BH = current power state (see #00111)
	    else failed
SeeAlso: AX=4F10h/BL=00h,AX=4F10h/BL=01h,AX=A00Dh