linux-kernel - Re: LED devices & poll() for brightness attribute

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Message-ID: <e87ee6f8-8c7e-7370-33ae-6f420f91a582@redhat.com>
Date:   Fri, 24 Feb 2017 09:52:11 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Pali Rohár <pali.rohar@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org
Subject: Re: LED devices & poll() for brightness attribute

Hi,

On 24-02-17 09:50, Pali Rohár wrote:
> On Thursday 23 February 2017 22:03:21 Pavel Machek wrote:
>> So, if you seriously want to do this, can you
>>
>> 1) write specification explaining how desktops should poll() the
>> brightness files
>>
>> 2) get someone to volunteer to implement that specification for at
>> least GNOME and KDE?
>
> Hm... Probably I should try to implement it myself :-) and look deeply
> what I'm proposing...
>
> Hans, you probably already did some changes for hw brightness changed
> attribute... Do you have some links or application parts which handle
> this for GNOME, KDE or other DE? So I could look at correct application?
>
> IIRC KDE4 uses upowerd for controlling keyboard backlight.

Gnome uses upower too, and current upower master has patches to
support brightness_hw_changed which you could use as a start.

Regards,

Hans