Int 14 Fn AA09  - Dimvga V2.0+ - Undim Screen 'manually'                   [V]

   AX = AA09h

Return: AX = FFFFh

Note:  this function will undim the screen immediately, even if DimVGA is
     currently disabled

See Also: AX=AA01h,AX=AA08h
Index: screen saver;DimVGA