On Wed, 2014-10-29 at 22:16 +0100, Pavel Machek wrote: > 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.
Android devices don't suspend to RAM. Neither do Tizen devices AFAIK. > So I agree -- using suspend to RAM on "active" cell phone is just a > bad design. I don't think anyone was discussing cell phones in particular in this thread, and knowing when user-space got woken up because of the baseband processor having information for us would still be useful. -- 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/
