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From: Oliver Neukum <oliver@neukum.org>
Organization: Novell
To: Arve =?iso-8859-1?q?Hj=F8nnev=E5g?= <arve@android.com>
Subject: Re: [RFD] Automatic suspend
Date: Wed, 18 Feb 2009 23:44:05 +0100
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Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Alan Stern <stern@rowland.harvard.edu>,
       "Woodruff, Richard" <r-woodruff2@ti.com>,
       Arjan van de Ven <arjan@infradead.org>,
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       LKML <linux-kernel@vger.kernel.org>, Pavel Machek <pavel@ucw.cz>,
       Nigel Cunningham <nigel@nigel.suspend2.net>,
       Matthew Garrett <mjg59@srcf.ucam.org>,
       mark gross <mgross@linux.intel.com>, Uli Luckas <u.luckas@road.de>,
       Igor Stoppa <igor.stoppa@nokia.com>,
       Brian Swetland <swetland@google.com>, Len Brown <lenb@kernel.org>
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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