HP Elite x3 Manual page 18

Lock screen
If the lock screen is active, you may have to swipe up on
the screen before you can access the Start menu.
The lock screen displays while the phone is idle. Swipe up
from the lock screen to unlock the phablet and view the
Start menu.
Note: If the device is set up with a PIN or biometric login, the
user may have to authenticate themselves to unlock the lock
screen.
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