linux-kernel - Re: [PATCH] eeepc-laptop: enable camera by default

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Date:	Fri, 5 Jun 2009 15:02:28 +0200
From:	Corentin Chary <corentin.chary@...il.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	acpi4asus-user@...ts.sourceforge.net, len.brown@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] eeepc-laptop: enable camera by default

On Fri, Jun 5, 2009 at 2:44 PM, Pekka Enberg<penberg@...helsinki.fi> wrote:
> Hi Corentin,
>
> On Fri, 2009-06-05 at 13:46 +0200, Corentin Chary wrote:
>> First, I think a one line
>> set_acpi(CM_ASL_CAMERA, 1);
>> with a small comment is better. (If it fails, it's because there no
>> camera, so we don't mind).
>
> OK, I've included an updated version of the patch.
>
> On Fri, 2009-06-05 at 13:46 +0200, Corentin Chary wrote:
>> Anyway, I'm not sure it's a good idea to enable the camera by default.
>> It depends how many power the camera is using (when idle). Coud you
>> check that (with power top maybe ?).
>
> People who prefer power savings over functional camera can always
> disable it. If you look at the amount of "my camera doesn't" work bug
> reports, I think it's pretty evident that we should enable it by default
> or provide a config option that does it.

Ok, your right, I'll apply that one

> That said, I am more than happy to measure this but I need a little bit
> more information to get started as I have never used powertop. So what
> is it exactly you want me to do?

PowerTop (with a corretly configured kernel) will give you a power
usage estimate.

CONFIG_NO_HZ=y
CONFIG_TIMER_STATS=y
CONFIG_DEBUG_KERNEL=y

For propers results, shutdown all services and just keep a shell
(without X or network).
You can also test that with and without the camera driver.

-- 
Corentin Chary
http://xf.iksaif.net - http://uffs.org
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