Why iOS 9’s Facedown detection doesn’t work on iPhone 4s iPhone 5 iPad
and iPod touch
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Why iOS 9’s Facedown detection doesn’t work on iPhone 4s iPhone 5 iPad and iPod touch
Facedown detection stands as one of the underrated features in iOS 9�s rich arsenal of power-saving tactics designed to help extend your run time by up to an additional hour.
Facedown detection avoids turning the display on when a notification comes in and your phone is put facedown. But as it turns out, Facedown detection doesn�t work on all devices compatible with iOS 9 and there is a good explanation for that why.
Gautam Prabhu explains that Facedown requires the M7, M8 or M9 motion co-processors which are found inside the following iOS devices:
M7� iPhone 5s, iPad Air and iPad mini 3
M8� iPhone 6, iPhone 6 Plus, iPad Air 2 and iPad mini 4
M9� iPhone 6s, iPhone 6s Plus, iPad mini 4 and iPad Pro
In addition to a motion co-processor, Facedown detection requires the proximity and ambient light sensors, too.
�Thanks to ambient light and proximity sensors, your iPhone knows if it�s facedown on the table and prevents the screen from turning on, even when you receive a notification,�confirms the iPhone 6s webpage.
Due to these requirements, Facedown is not supported on the following devices:
iPhone 4s and iPhone 5�Apple�s motion coprocessor was first introduced with the iPhone 5s and is unavailable in prior iPhone models.
iPads�Although some iPad models like the iPad Airs, the iPad mini 3 and 4 and the iPad Pro come outfitted with the motion coprocessor, Facedown detection cannot be supported on these devices as they don�t come with proximity sensors.
iPod touches�Although the sixth-generation iPod touch now includes the M8 motion coprocessor, it lacks both the ambient light and proximity sensors so Facedown detection cannot be realized in a power-efficient manner.
About motion co-processors
Apple�s motion co-processors were designed to calibrate and poll integrated accelerometer, gyroscope, proximity and compass sensors without waking up the power-hungry main central processing unit (CPU).
Beginning with the iPhone 6s and iPad Air, Apple�s motion coprocessor is now integrated within the main A9/A9X chip rather than being a separate module. In addition, it�s always on which makes possible untethered �Hey Siri� functionality on these devices.
How iOS 9 saves your battery
iOS 9 employs several energy-saving techniques to extend your run time by up to an hour. In addition to core OS optimizations designed to trim battery use whenever possible, iOS 9 cuts the display power and mutes Lock screen notification alerts when your device is facedown on the table.
But that�s not all: other power-saving tactics include a new Low Power Mode which gives you up to three hours of additional run time and more granular battery-related options in the Settings app.
