Why "The definition of an inverted screen" does not work on certain iOS-devices

As we mentioned earlier, Apple has tried to improve energy efficiency in iOS 9. One way It has become a new featureWhich do not activate the display of incoming notifications if the device is flipped face down. Because of how many notifications users receive today, this is a minor change can save up to an hour of operation.

But, as it turned out, it did not work on some devices. In particular were deprived iPhone 4s, iPhone 5, iPod touch, the first four-generation iPad and iPad mini 1 and 2. Why is that?

A small study showed that the function works only if the gadget is relatively recently introduced a series of co-processors "M". To date, they have the following devices:

• M7 - iPhone 5s, iPad Air and iPad mini 2
• M8 - iPhone 6, iPhone 6 Plus, iPad Air 2, iPad mini 3.
• M9 - iPhone 6s, iPhone 6s Plus, iPad mini 4, iPad Pro.

Also located on the front panel should be a light sensor. So, in all these gadgets in the beginning of this article does not support the new function for the following reasons:

• iPhone 4s / 5 - for the first time co-processor series "M" was introduced only in the iPhone 5s.
• iPad - in the first four models of iPad and the first two generations of iPad mini coprocessor "M" also was not.
• iPod touch - the problem is that the player is no light sensor. It was removed to make player so thin.

Nevertheless, use of other energy-saving benefits of iOS 9 mode, which we detail previously toldUsers can.

(via)