xbacklight on intel

[David Sharp]

On Nov 28, 2007 6:43 AM, Colin Guthrie <gmane at colin.guthr.ie> wrote:
> Khashayar Naderehvandi wrote:
> >
> >
> >
> >     So your machine is defaulting to the native register interface.  I
> >     wonder if
> >     it should be using the legacy interface instead?  Can you try
> >      $ xrandr --output LVDS --set BACKLIGHT_CONTROL legacy
> >     and see if xbacklight works for you then?
> >
> > After changing it to legacy it still does not work. However, runing
> > xbacklight -get I know get a figure (around 0.5), whereas before
> > switching over to legacy xbacklight returned the mysterious string "nan".
>
> nan probably == "Not a Number" ala Javascript etc. Quite why this is,
> however, I haven't the foggiest!

probably the result of 0.0 / 0.0

Why this calculation is done, I have no idea.

This prints "nan" on my machine:

#include <stdio.h>
int main(int argc, char *argv[]) {
  printf("%f\n", 0.0/0.0);
  return 0;
}

>
> Col
>
>
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