Bug#509307: xbacklight: -set does nothing if it thinks the setting is already correct

[Reuben Thomas <rrt@sc3d.org>]

On Sun, 1 Feb 2009, Brice Goglin wrote:

> Reuben Thomas wrote:
> > Package: xbacklight
> > Severity: normal
> >
> > xbacklight -set sometimes has no effect. For example, when I suspend and
> > resume my laptop, the backlight is reset to 100%, but is still reported
> > as whatever I set it to before. xbacklight seems to do nothing if I try
> > to set it to the same value; instead, I must first set it to a different
> > value.
>
> It may be a bug in the driver. If the driver doesn't reset its backlight
> value on suspend/resume, xbacklight will read a wrong value from it, and
> thus do nothing if the set the same value.
>
> Did you actually ever observe the bug when not resuming from suspend?

No. I'm not sure how I would set up an equivalent circumstance, i.e. change 
the backlight without running xbacklight. For example, the Fn keys for 
changing the brightness on my Samsung NC-10 do not currently work.

> Which driver do you use?

intel, with a 2.6.28 kernel.

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