INT 10 - VIDEO - FLAT-PANEL - CONTRAST CONTROL FOR TEXT/GRAPHICS

	AX = 1E06h
	BH = function
	    bit 7: =1 set contrast control, =0 query contrast
	    bits 6-0: reserved (0)
	---if BH bit 7 set---
	BL = new normal/reverse video setting (see #00059)
Return: AL = 1Eh if function supported
	    BH = results
		bit 7: query/set (copied from input)
		bits 6-4: reserved (0)
		bit 3: software contrast control supported for text
		bit 2: software contrast control supported for graphics
		bit 1: hardware supports independent control of contrast
		      in text and graphics modes
		bit 0: set operation was successful (always clear on get)
	    BL = active contrast setting (see #00059)
Note:	this function operates independently of AX=1E08h
SeeAlso: AX=1E00h,AX=1E04h,AX=1E05h,AX=1E07h,AX=1E08h