Without much fanfare, Apple implemented some interesting features in the iOS 9 to help iPhones save energy. It's all there, in the release notes for the new system:
Longer battery life
- Up to an hour of additional time before you need to charge the battery;
- Screen detection down to turn off the screen when not in use;
- Low power mode optimizes device performance to extend battery life for up to three additional hours.
An hour of additional time and Low Power Mode we have already commented on the site, but the screen detection is down in order to turn off the screen when not in use. We know that the iPhone screen is one of the most battery-consuming things, so anything that helps the device in that sense is very welcome. Because the channel TechIntimidation YouTube (as reported by the website iPhone Hacks) deeply analyzed this new feature and shared relevant information.
Apple does not explain, but everything suggests that the feature uses the M7 / 8/9 coprocessors (present in the iPhones 5s, 6/6 Plus and 6s / 6s Plus, respectively) to collect information from the accelerometer / gyroscope / compass sensors and determine if the iPhone has the screen facing down. Upon identifying this scenario, the device stops turning on the screen when a notification arrives. As the screen does not turn on, there is no waste of energy. more or less what the Apple Watch does with the iPhone, because when you have the Apple watch on your wrist all notifications are forwarded to it, saving the iPhone from turning on the screen all those times.
Using the coprocessor for this task has its pros and cons. One of the pros that the feature works on any surface (for example, a glass table). In fact, it doesn't even need to be supported on a surface for this to happen. If you suspend your iPhone with the screen down, you will see that even with the arrival of a notification the screen will not turn on.
The bad part that the device needs to be lying with the screen down. If you put it in your pocket, for example, the screen will continue to light, using up the battery unnecessarily. In addition, only iPhones from the 5s can take advantage of this feature (due to the presence of the M7 / 8/9 coprocessor).
We don't know exactly how this feature works, but even analyzing the video above (test done with stickers so that the iPhone would be suspended with the screen facing down), we can conclude that Apple does not take into account data from the ambient light sensors and proximity.
If you did this, even though the iPhone is not lying with the screen facing downwards when you put it in your pocket, it would be very easy to activate the feature by taking into account that the dark place (ambient light) and that the device is close to something (cala) to the point that it is not necessary to activate the screen who knows all this will not be implemented later
There is no option to turn this feature off, but if you disable the option “Track Physical Preparation” in General Privacy Movement and Physical Preparation, failing to collect data from the sensors consequently, the resource stops working. However, in doing so, you will obviously no longer be able to view relevant information captured by the coprocessor, such as number of steps, calories burned, etc.
Regardless of not working in our pockets, turn off the screen when not in use (with the screen down) very smart!
(via The Loop)
Update · 9/21/2015 at 7:00 pm
As highlighted in the comments, Apple warns, yes, on the iOS 9 news page that uses ambient light and proximity sensors in the resource, see:
Longer battery life.
We improve the efficiency of the entire operating system, apps and key technologies to reduce battery consumption as much as possible in what you do every day. Thanks to the ambient light and proximity sensors, your iPhone knows if the screen is facing down on the table and it does not light up when you receive a notification. The new Low Energy mode (actually Low Energy) allows your battery to last even longer.
Although Apple claims this, the test shown on the video (iPhone suspended in the air facing down) shows that, at the very least, there is something badly told in this story.