Int 10 Fn 12  - Cirrus Logic BIOS V3.02 - Lcd Panel - Enable/disable Expa  [V]

   AH = 12h
   BL = 8Fh
   AL = new state (00h enabled, 01h disabled)

Note:  when expand mode is enabled, the vertical dimension is enlarged to
     full screen

See Also: AH=12h/BL=84h,AH=12h/BL=89h,AH=12h/BL=8Bh,AH=12h/BL=90h