linux-kernel - Re: [RFC PATCH] PM / Runtime: runtime: Add sysfs option for forcing runtime suspend

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Message-ID: <20150921202013.GA11745@amd>
Date:	Mon, 21 Sep 2015 22:20:13 +0200
From:	Pavel Machek <pavel@....cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Rafael J. Wysocki" <rafael@...nel.org>,
	Octavian Purdila <octavian.purdila@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"Tirdea, Irina" <irina.tirdea@...el.com>,
	Oliver Neukum <oneukum@...e.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [RFC PATCH] PM / Runtime: runtime: Add sysfs option for forcing
 runtime suspend

On Mon 2015-09-21 10:38:46, Alan Stern wrote:
> On Mon, 21 Sep 2015, Pavel Machek wrote:
> 
> > > > In fact, then, what you need seems to be the feature discussed by Alan
> > > > and me some time ago allowing remote wakeup do be disabled for runtime
> > > > PM from user space as that in combination with autosuspend should
> > > > address your use case.
> > > 
> > > That, plus they want the touchscreen to go into runtime suspend 
> > > whenever the screen is off (was this not the main reason for the 
> > > patch?).
> > > 
> > > It seems to me that it should be possible to arrange for this to happen 
> > > simply by making userspace close the touchscreen device when the screen 
> > > is turned off.  Or am I missing something?
> > 
> > Well... that's not what existing userspace expects. Your X windows
> > server will not close the touchscreen.
> 
> Surely that's a userspace issue, rather than a kernel problem?  The X
> server does have some notion of power management and power savings; why
> not extend that notion to include touchscreens?

Well... once upon a time, it was kernel job to mask differences
between different hardware platforms.

In a way, the hardware is "buggy" -- if your mouse clicked randomly
when you were not holding it in your hand it would be buggy... and it
would be nice for kernel to fix that "bug". 

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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