ThinkPad Lock on Leave can work

ThinkPad Lock on Leave

Lock on Leave for the ThinkPad P14s Gen 4 is well hidden!

• Windows Presence Sensing is not supported.
• Instead, Lenovo provides its own Lock on Leave feature.
• Locking may not be reliable in some environments, like noisy cafes!
• Lenovo documentation is not correct! 
• Expanded How To in Lenovo Community.
• Likely applies to T14 Gen 4, P14s Gen 4, T16 Gen 2, P16s Gen 2.
• It may also apply to P14s Gen 5 and P16s Gen 3.

How to enable Lenovo Lock on Leave

1. In BIOS Settings → Security → Intelligent Security → enable User Presence Sensing.
2. In Commercial Vantage (from Microsoft Store) → Device Settings → Smart Assist → enable Zero touch lock.

Windows Settings 

1. Use Default settings in Windows Balanced Power Plan.
2. Set Screen Saver to (None) because it is redundant and possibly counterproductive.

What actually happens

• ~20 seconds of no presence → screen dims
• ~10 seconds later → screen blanks & locks
• No wake‑on‑return, but Windows Hello can activate and unlock on a keypress
• Invisible: no tray icon, no indicator, no tuning

How it works

• Uses speakers to emit ultrasonic pulses
• Uses microphones to read reflections
• Elliptic’s AI model decides “present” vs “absent”
• No dedicated hardware sensor, no FRU

Side effect
Some users can hear the ultrasonic chirps due to:

• speaker distortion
• harmonics
• individual high‑frequency sensitivity

If you hear it, you’re not imagining it.