Illuminated keyboard on ASUS U50VG laptop, backlight or led ?

[Danny Kukawka]

On Donnerstag, 6. August 2009, Corentin Chary wrote:
> On Thu, Aug 6, 2009 at 12:48 PM, Danny Kukawka<danny.kukawka at web.de> wrote:
[...]
> > Can you please provide a "grep . */*" from /sys/class/leds/ with the
> > affected device? If I read the kernel doc for leds (which this device
> > is), we don't need a num_levels for it:
> >
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f
> >=Documentation/leds-class.txt;h=6399557cdab3d6542a0feea0c0cd2c6b2af5ffad;h
> >b=HEAD
> >
> > "... The brightness file will set the brightness of the LED (taking a
> > value 0-255). Most LEDs don't have hardware brightness support so will
> > just be turned on for non-zero brightness settings. ..."
>
> The documentation is probably out of date, the led class provide
> a max_brightness file. 255 is the default value, but it can be overridden.
>
> See:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=d
>rivers/leds/led-class.c;h=f2cc13d76810f457c752d6f92f53759980f465ea;hb=HEAD#l
>76
>
> leds-dac124s085.c define it to 0xFFF for example.
> And asus-laptop will soon use 3 as max_brightness for asus::kbd_backlight.
>
> But still, it seems that examples/light_sensors_and_keyboard_backlight.py
> and others are using something that is not defined in hal-spec-properties.

Thanks for the information. Please check out my latest commits:
http://cgit.freedesktop.org/~dkukawka/hal/log/

I hope this finally solve the problem.

Danny