[arch-general] Fn-F{5, 6} keys for backlight - how to disable native handling?

[Martín Cigorraga]

On Wed, Jun 26, 2013 at 2:22 PM, Leonardo Dagnino <leodag.sch at gmail.com>wrote:

> 2013/6/25 Oon-Ee Ng <ngoonee.talk at gmail.com>
>
> > I have an ASUS N56V where the Fn-F{5,6} keys do not work natively (no
> > output in xev when pressed). This is very easily worked-around using
> > acpi_os="!Windows 2012".
> >
> > The resulting control is something along the 3-10 range (10 being
> > brightest and 0 being off, these are not the actual numerical values),
> > which means I can't dim my backlight beyond a certain value.
> > Similarly, using xbacklight and setting to 0 actually gives a "3"
> > backlight, not totally blank. Setting
> > /sys/class/backlight/intel_backlight/brightness to 0 does turn the
> > screen off though.
> >
> > The problem is that if I write a simple script to adjust brightness
> > and bind that using xbindkeys, the native handler still works for a
> > fraction of a second before the value I calculate takes effect. This
> > results in a brief flicker everytime I press the keys.
> >
> > Conclusion - I want to disable this native handling of Fn-F{5,6}, is
> > this possible or is this not software-controlled?
> >
>
>
Before giving up the native handling please try adding the kernel flag
"acpi_backlight=vendor".