Re: [gpm] [PATCH 2.6.29] eeepc-laptop: report brightness controlevents via the input layer

From: Alan Jenkins
Date: Tue Jun 16 2009 - 04:34:51 EST

Richard Hughes wrote:
> On Mon, Jun 15, 2009 at 9:09 AM, Alan
> Jenkins<alan-jenkins@xxxxxxxxxxxxxx> wrote:
>> So during step iii) I think you see the firmware
>> increase the brightness, then g-p-m decrease the brightness, and then
>> g-p-m catches up and the brightness increases again.
> Sorry for not responding sooner, been moving house.
> I don't think the kernel driver should modify the brightness itself,
> as that's applying policy. Is this is left to userspace then we can
> put on policy such as "don't allow brightness to be set below 30%" or
> "automatically set the brightness using a ambient light sensor, and
> use the brightness keys to set ambient thresholds".
> Doing this policy in the driver is the wrong thing to do IMO.
> Richard.

The driver doesn't. As far as we know, none of them do. Firmware does.

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