Message-ID: <1414680160.2406.53.camel@hadess.net>
Subject: Re: A desktop environment[1] kernel wishlist
From: Bastien Nocera <hadess@hadess.net>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andy Lutomirski <luto@amacapital.net>, Pavel Machek <pavel@ucw.cz>,
        John Stultz <john.stultz@linaro.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Date: Thu, 30 Oct 2014 15:42:40 +0100
In-Reply-To: <20141029202616.GC5000@thunk.org>
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On Wed, 2014-10-29 at 16:26 -0400, 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.

Power up the screen or the touchscreen?

>   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.

We still have a huge install base that does use suspend though, and for
which this information would be useful.

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