On Tue, 17 Nov 2009 15:39:09 -0500 Lewis G Rosenthal wrote:
  

   This option controls whether the LCD BIOS is used on laptops. This
   option defaults to auto, which means
   that the BIOS will be used when the laptop is booted on the LCD
   panel, and will not be used when it is
   booted on an external CRT monitor. If you frequently switch between
   LCD and CRT screens, you may
   wish to set this option to on, so that the graphics modes will be
   limited to those that can be properly
   displayed on the LCD panel. Note that many laptop chipset drivers
   have been updated to have more
   intelligent switching code, and will ignore this option.
    

I ordinarily use the LCD screen but occasionally need to use both when doing a presentation.  Last week I booted the machine to windows (I needed to show a WMV file) and left it on both screens; however, today it had reverted to LCD only.  I had hoped that it would remember....