Huawei P9 - Manual (Page 6)

Locking and unlocking the screen
Press the power button to
lock the screen. If your phone
is idle for a specified period of
time, the screen will
automatically lock itself.
If the screen is off, press the
power button to turn it on.
Slide your finger in any
direction to unlock the
screen.
Swipe up from the bottom of
the screen to open the control
panel for magazine unlock.
You can also quickly launch
commonly used applications
without unlocking the screen.