linux-kernel - Re: [RFD] Automatic suspend

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Date:	Wed, 18 Feb 2009 23:44:05 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Arjan van de Ven <arjan@...radead.org>,
	Kyle Moffett <kyle@...fetthome.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

Am Wednesday 18 February 2009 23:35:26 schrieb Arve Hjønnevåg:
> >> Allowing user space to suspend input devices while they are still open
> >> is useful. The user-space code that reads from the input devices does
> >> not need to know if the device is suspended or not, and the kernel
> >> cannot auto suspend input devices based on inactivity.
> >
> > Hmm.  Why can't it?
> 
> Because they stop working. It is OK for us to turn off the touchscreen
> when the screen is off, but when the screen is on the user will touch
> items on the screen and expect them to respond. (We could also turn
> off the touchscreen when the keyguard is on, but we don't currently do
> this.)

This depends on the capabilities of the input device in question. Some
USB keyboards can be autosuspended under these conditions because
they can do remote wakeup.

	Regards
		Oliver
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