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

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Message-ID: <20090608030732.GA7018@srcf.ucam.org>
Date:	Mon, 8 Jun 2009 04:07:32 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	alan-jenkins@...fmail.co.uk, Pekka Enberg <penberg@...helsinki.fi>,
	Corentin Chary <corentin.chary@...il.com>,
	acpi4asus-user@...ts.sourceforge.net, len.brown@...el.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Darren Salt <linux@...mustbejoking.demon.co.uk>
Subject: Re: [PATCH] eeepc-laptop: enable camera by default

On Sun, Jun 07, 2009 at 11:03:48PM -0400, Alan Stern wrote:

> There's no mechanism for this.  It many environments it couldn't work,
> because the decision about whether to enable autosuspend is made when
> the device is first created (i.e., when the creation uevent is
> received), whereas driver binding doesn't occur until later.

There's a lot of power management situations where you don't end up with 
the optimal power configuration until a driver's bound. It's certainly 
possible to do this in userspace, but if we know that the hardware 
supported by a given driver will always work then it seems reasonable to 
have it whitelist autosuspend on that device.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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