External Monitors, Webcams & Audio with LockDown Browser on Mac
LDB on Mac actively detects external displays via Core Graphics and refuses to launch with multiple monitors connected by default. USB webcams and Bluetooth audio peripherals work but introduce specific quirks during the Respondus Monitor system check. Below: every peripheral category with dedicated fix pages.
How LDB detects peripherals
LDB queries Core Graphics + AVFoundation at launch:
CGDisplayActiveDisplayCount- counts active displays. >1 triggers the multi-display block (configurable in Dashboard).- AVFoundation
AVCaptureDevice- enumerates cameras and microphones. The system default is what Monitor uses. - Core Audio HAL - checks input device sample rate + format.
Detection is deterministic: the same hardware setup always produces the same result. Fixes are about adjusting the setup before LDB launches.
Dedicated entity pages in this cluster
- External monitor: detection mechanics + how to disable
- Dual-monitor detection: what counts and what doesn't
- USB webcam compatibility on Mac (Logitech, Razer, generic)
- AirPods microphone: the system-check timing issue
- Bluetooth headphones general compatibility
- Sidecar (iPad as second display): blocked by LDB
- How to cleanly unplug a second display before launch
Articles in this section
- LockDown Browser External Monitor on Mac (Detection + Workarounds 2026)
- Can LockDown Browser Detect a Second Monitor on Mac? (Yes - Here's How)
- USB Webcam Compatibility with LockDown Browser on Mac (Logitech, Razer, Generic)
- AirPods Microphone with LockDown Browser on Mac (System-Check Timing Fix)
- Bluetooth Headphones with LockDown Browser on Mac (Compatibility 2026)
- LockDown Browser Sidecar (iPad as Display) on Mac - Why It's Blocked
- How to Cleanly Unplug a Second Display Before LockDown Browser Launches