[honeyrapper]

I just noticed the proximity sensor stays awake all the time the screen is off, if "double tap to wake" feature is enabled. And if you cover the sensor then double tap does not work.
I assume proximity sensor consumes lesser battery than the screen digitizer (it does warn you on the settings page that "it reduces battery life".) So it might be a good idea to always place your phone with its screen facing down.

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[Ashish Saraf1]

I just noticed the proximity sensor stays awake all the time the screen is off, if "double tap to wake" feature is enabled. And if you cover the sensor then double tap does not work.
I assume proximity sensor consumes lesser battery than the screen digitizer (it does warn you on the settings page that "it reduces battery life".) So it might be a good idea to always place your phone with its screen facing down.

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Thanks for the tip..!!
Didn't know about sensor being on.

sent either from my Nokia Lumia 820 or HTC Desire HD

[lafn]

Isn't that the same sensor that is used for Glance, which doesn't come with a "consumers extra power" warning? Seems if you put it upside down for the double tap option the sensor is still active and using power whether it see's things or not.

[honeyrapper]

Isn't that the same sensor that is used for Glance, which doesn't come with a "consumers extra power" warning? Seems if you put it upside down for the double tap option the sensor is still active and using power whether it see's things or not.

Yes I guess for glance too.
So screen facing up = Proximity sensor on + Glance screen on + Double tap on.
And screen facing down(or phone in pocket) = Only proximity sensor on.

Also the sensor only shows a faint red light compared to the much brighter light when you're on a call. You can barely see it. So they're trying to conserve as much as possible, which is good.

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[kb4000]

Just to clarify it seems that the point being made is that double tap to wake uses the digitizer but when the proximity sensor is covered the phone disables the digitizer so that your phone won't turn on in your pocket. This would also save the battery because the digitizer would be off. The proximity sensor will use the same power either way.
I will however mention that I do not recommend placing your phone screen down to save battery. I'd rather sacrifice a tiny bit of battery life than scratch my screen.

[honeyrapper]

Just to clarify it seems that the point being made is that double tap to wake uses the digitizer but when the proximity sensor is covered the phone disables the digitizer so that your phone won't turn on in your pocket. This would also save the battery because the digitizer would be off. The proximity sensor will use the same power either way.
I will however mention that I do not recommend placing your phone screen down to save battery. I'd rather sacrifice a tiny bit of battery life than scratch my screen.

Yeah me too. I shared it with you all just in case you didn't know already.
By the way, I think digitizer consumes significantly more power than the sensor considering how big the screen is, or else they wouldn't bother.

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[kb4000]

By the way, I think digitizer consumes significantly more power than the sensor considering how big the screen is, or else they wouldn't bother.

I think the main reason the set it up that way is to avoid accidental "double taps" in your pocket, not for battery life reasons, but it is a nice side benefit. Anyway, thanks for the tip.

[honeyrapper]

I think the main reason the set it up that way is to avoid accidental "double taps" in your pocket, not for battery life reasons, but it is a nice side benefit. Anyway, thanks for the tip.

Forgive me for dragging this, but I just can't imagine how a screen can get double tapped inside a pocket. I mean a double tap is a very specific combination a two taps, with zero distance in between, within like half a second of time. How does that happen "accidentally" inside a pocket or even out of it?

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[kb4000]

You'd be surprised. I used to have a Nokia N9 which had double tap to wake. It would get turned on in my pocket quite often so I had to turn off double tap to wake.

[honeyrapper]

Fair point. Weird things do happen when I pocket my phone without turning off the screen. Once a gibberish message even got written and sent to a friend .. LOL

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[kb4000]

Haha yeah. My phone has an annoying habit of pausing the music when I'm working out. I don't know how that happens.

[Coreldan]

I havnt had any signifigant impact on battery life after I turned on double tap to wake when it first became available. Even if it did, though, I would rather take diminished battery life over this somewhat unproven theory that will most certainly cause microscratches on the screen :P

[kb4000]

I havnt had any signifigant impact on battery life after I turned on double tap to wake when it first became available. Even if it did, though, I would rather take diminished battery life over this somewhat unproven theory that will most certainly cause microscratches on the screen :P

My thoughts exactly.

[Dandun Widiyanto]

It adds about 1.50% per hour battery consumption on my L620.

[Adriaan NL]

My thoughts exactly.

My thoughts too, even though my 920 is battery hungry.

[kb4000]

It adds about 1.50% per hour battery consumption on my L620.

What does exactly? Double tap to wake?

[herbertsnow]

My phone has case and screen protector so face down it goes. Great tip.