linux-kernel - Re: Power-managing devices that are not of interest at some point in time

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Date:	Wed, 16 Jul 2014 23:36:05 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Dmitry Torokhov <dtor@...gle.com>,
	Patrik Fimml <patrikf@...omium.org>, linux-pm@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Benson Leung <bleung@...gle.com>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Power-managing devices that are not of interest at some point
 in time

On Wed, 2014-07-16 at 14:08 -0400, Alan Stern wrote:
> > I am not so much concerned about userspace, but about reusing of as
> > much of existing PM framework in the drivers. Right now it is very
> > hard to correctly track dependencies between general open/close,
> > system suspend/resume, and various runtime-PM transitions. Adding
> yet
> > another PM mechanism into the mix will just add more complexity.
> 
> Would it make sense to unbind the drivers for these devices when the 
> lid is closed?  With the drivers gone, there would naturally be no 

No, because I don't want settings of my devices to disappear.
You can do that only for stateless devices. And I doubt you can
tell in general which devices are stateless.

	Regards
		Oliver


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