INT 10 - SOLLEX SuperVGA - POWER CONTROL - SET POWER STATE
        AX = 7F04h
        BL = 00h
        CX = new power state
Return: AL != 7Fh if not supported
        AL = 7Fh if supported
            AH = status
                00h successful
                01h failed
Note:   higher values progressively reduce the operations available on the
          video adapter while yielding increasing power savings
SeeAlso: AX=7F04h/BL=01h