linux-kernel - Re: [gpm] [PATCH 2.6.29] eeepc-laptop: report brightness control events via the input layer

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Date:	Thu, 18 Jun 2009 14:33:57 +0100
From:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
To:	Richard Hughes <hughsient@...il.com>
Cc:	Corentin Chary <corentin.chary@...il.com>,
	gnome-power-manager-list@...me.org,
	acpi4asus-user@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Darren Salt <linux@...mustbejoking.demon.co.uk>
Subject: Re: [gpm] [PATCH 2.6.29] eeepc-laptop: report brightness control 
	events via the input layer

On 6/16/09, Richard Hughes <hughsient@...il.com> wrote:
> On Tue, Jun 16, 2009 at 10:44 AM, Corentin
> Chary<corentin.chary@...il.com> wrote:
>> Ok, so we just need to patch this file :
>> http://cgit.freedesktop.org/hal-info/tree/fdi/information/10freedesktop/10-laptop-panel-hardware.fdi
>
> Yes
>
>> But I'm not sure how to do it to make it works on all Eeepc.
>
> Well, really we want to match "classes of eeepc", so matching with
> prefix might be a good idea.
>
> Richard.

Yes please!  I see the 701 is (just added?) on the list, but this
applies to any hardware which is driven by the eeepc-laptop driver.
There is no "brightness up key" or "brightness down key" notification
recognised by the driver, only "brightness level is now equal to X".

Btw, I looked at other drivers and fujistsu-laptop is implemented in
the same way.

I guess the problem is the DMI manufacturer and product name don't
mention "EeePC".  At least on my model, the serial number starts with
"EeePC-", so we _could_ try to use that.

But I hope there's a nicer solution.  Corentin, do you think it would
be correct to apply this quirk to _all_ Asus laptops?

At the moment asus-laptop doesn't generate brightness events.  The
deprecated asus-acpi driver generates brightness events (via the old
procfs interface).   But the BR_UP/BR_DOWN events carry an absolute
brightness value; it strongly suggests that the firmware modifies the
brightness.  asus-acpi uses the brightness value to update a generic
backlight device - so we already rely on the value being correct,
otherwise g-p-m's heuristic won't work.

Thanks
Alan
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