Date: Wed, 29 Oct 2014 22:16:08 +0100
From: Pavel Machek <pavel@ucw.cz>
To: "Theodore Ts'o" <tytso@mit.edu>, Andy Lutomirski <luto@amacapital.net>,
        Bastien Nocera <hadess@hadess.net>,
        John Stultz <john.stultz@linaro.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: A desktop environment[1] kernel wishlist
Message-ID: <20141029211608.GA32576@amd>
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On Wed 2014-10-29 16:26:16, Theodore Ts'o wrote:
> On Wed, Oct 29, 2014 at 12:19:56PM -0700, Andy Lutomirski wrote:
> > For a tablet, isn't the relevant piece of information whether the power
> > button was recently pressed, not whether the power button caused the wakeup?
> 
> For Android L devices, it has been reported that the device might
> power up its screen fully (note I didn't say 'wake up') automatically
> when it detects that you are picking it up, or when you double-tap the
> screen.  It also reportedly has a low power black and white "ambient
> display" (ala the Android Wear devics) which allows you to see
> notifications without waking up the phone all the way[1].  (All of
> this assuming appropriate hardware support, of course.)
> 
> [1] http://www.androidauthority.com/ambient-display-lollipop-541198/
> 
> Which goes back to the concept of having a "suspend" mode is legacy
> thinking.  Modern devices will soon have not just a "awake" and a
> "asleep" modes; there will be (well, is now) a much wider spectrum of
> modes, with the goal of using the minimum amount of power while still
> providing use functionality to the user.

Actually Maemo people (on Nokia N900 and friends) got it right: unlike
android devices, it does not suspend to RAM at any point, and still
has reasonable battery life.

So I agree -- using suspend to RAM on "active" cell phone is just a
bad design.

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