My application inverts its screen when the back light is on to keep the
image looking the same in either viewing mode.

The only catch is I haven't yet foudn a way to determine the absolute
state of the backlight, so the user has to manually set this every time
he thows off the toggle count.

Is there any way (documented or undocumented) to tell if the back light
is on?

So far, the best lead I have is that when the back light is on there is
a very faint humming noise....

Thanks!
- Jeff


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