How to Enable and Configure Snooping Detection and Screen Dimming on Chromebook in ChromeOS

Working on a laptop in public or shared spaces—such as open-plan offices, coffee shops, trains, or airport lounges—frequently exposes sensitive personal data and business documents to prying eyes. While privacy screen filters offer physical protection by narrowing horizontal viewing angles, they dim display brightness and distort colour accuracy for the user. To provide automated, dynamic defence against visual eavesdropping, Google introduced Smart Privacy capabilities into ChromeOS. Powered by integrated human presence sensors (HPS) and dedicated ultra-low-power microcontrollers, Chromebooks equipped with this technology can detect when someone looks over your shoulder, alert you immediately, and dynamically dim the screen.

Hardware Prerequisites for ChromeOS Smart Privacy

Before configuring visual privacy controls, verify whether your Chromebook hardware includes the requisite sensor suite:

• Human Presence Sensor (HPS): Snooping Detection relies on an ultra-low-power vision sensor or radar module integrated into the display bezel next to the web camera. It does not stream, capture, or store video feeds to system memory; analysis occurs entirely on-device at the sensor level to preserve battery life and privacy.
• Compatible Chromebook Models: The feature is available on enterprise, executive, and education devices featuring HPS hardware (such as select HP Elite Dragonfly Chromebooks, Lenovo ThinkPad C14 Chromebooks, and Acer Chromebook Vero models).
• ChromeOS Version: Ensure your Chromebook is updated to ChromeOS 100 or later where Smart Privacy controls are integrated into native system settings.

Enabling and Customising Snooping Detection

To turn on shoulder-surfing protection and customise the alert mechanisms:

1. Click on the Quick Settings panel in the bottom-right corner of your shelf (the clock area) and click the Settings gear icon.
2. In the left-hand navigation menu, select Security and Privacy.
3. Click on Smart Privacy. (If this section is absent from your settings menu, your hardware does not include the HPS presence-sensing module).
4. Locate the Snooping detection option and toggle the switch to the On position.
5. Customise the notification behaviour based on your preference:
   • Show Eye Icon Alert: When active, a subtle eye indicator appears in your bottom-right system shelf whenever an individual stands behind you and looks toward your screen for longer than two seconds.
   • Display On-Screen Warning Banner: A temporary banner will pop down from the top edge of the display stating that a bystander has been detected.

Configuring Automatic Screen Dimming on Detection

For high-security workflows involving financial ledgers, code repositories, or confidential correspondence, you can instruct ChromeOS to obscure screen contents automatically the instant an onlooker is detected:

1. Within the Smart Privacy settings panel, scroll down to Screen protection.
2. Check the box labelled Dim screen when a bystander looks over your shoulder.
3. When enabled, the display panel immediately reduces brightness to near-zero and applies an opaque privacy scrim across active windows the moment the sensor registers a second face in the background.
4. The display automatically restores full brightness and clarity as soon as the bystander steps away or looks in another direction, allowing you to resume typing without entering your password or PIN.

Managing Battery Impact and Disabling Presence Sensing

To ensure optimal system performance when operating on battery power:

• Power Consumption: Because the HPS module operates independently of the main Intel, AMD, or ARM processor, running Snooping Detection consumes less than 1 percent of additional battery capacity during typical daily workflows.
• Webcam Indicator Light: Because the presence sensor operates as a dedicated discrete module, the green LED webcam indicator light does not illuminate during background presence monitoring. The LED illuminates solely when the primary RGB camera is activated by video-calling applications.
• Disabling When Presenting: If you are delivering a presentation from your laptop with colleagues gathered around your desk, temporarily disable Snooping detection in Quick Settings to prevent intentional group viewers from triggering screen dimming.