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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
