DeviceKit-power and backlight brightness

[Ali Abdallah]

Richard Hughes wrote:
> As we all know, the hal-ectimisation continues. At the moment,
> gnome-power-manager still uses HAL for two things:
>
> * Ambient light sensors
> * Setting the backlight on hardware without xrandr BRIGHTNESS support,
> or where xrandr falls over
>
> Now, I've held off adding support for backlight devices to
> DeviceKit-power in the past, as I always believed that xrandr was the
> way to go long term. Unfortunately, I think only the Intel Xorg driver
> has support for this interface, and it seems to work only for select
> drm versions (and depending on the phase of the moon). Therefore, I
> think we need to support kernel backlight devices as these still
> account for the majority of laptops, and nearly all embedded hardware.
>
> And then there are ambient light sensors. HAL supports a few different
> types, but that would be pretty easy to copy the code and move it
> somewhere else.
>   

Great to hear that, that's the only one issue which prevents me from 
completely remove
HAL dependency in Xfce power manager, i'm will be happy to drop HAL if 
devkit-power
supports brightness control like HAL does to avoid any regression that, 
i'm sure, users
will complain a lot about.

My opinion on these questions.
> So, some questions:
>
> * Do we still need to support backlight devices, even in a XBACKLIGHT world?
>   
No.

> * Does the brightness functionality belong in DeviceKit-power or
> something else (DeviceKit-backlight?)
>   
Brightness functionality should be in DeviceKit-power, as for the lid 
device, only power managers
are looking for these informations, and i don't think there is point to 
have DeviceKit-backlight.

> * Do we want to move the ambient light sensor stuff at the same time?
>   
No.

> * Do we support hardware with more than one backlight device
> (shouldn't, but could happen)
>   
I'm not sure about this, but i would say no for the moment.

> Advice required. Thanks.
>
> Richard.
>   

Thanks,
Ali.

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>   


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