the camera works but faces or the whole image are underexposed
This symptom concerns the camera path. Start with a neutral DeviceOK test where available so the next step is based on evidence rather than a generic reset sequence.
Do not jump to the most invasive fix
Avoid destructive resets, unofficial driver packages, firmware flashing, or replacing hardware before the simpler detection, permission, connection and configuration checks are exhausted.
Retest the same condition
After every meaningful change, repeat the same test under the same conditions and compare the result.
Rule out the simple causes
- 1
Put a light in front of you rather than behind you.
- 2
Run the Camera Exposure Step Chart and live webcam test.
- 3
Disable or compare virtual backgrounds/low-light features in the affected meeting app.
Work through the problem in order
- 1
If DeviceOK looks normal but one app is dark, inspect that app's camera enhancements and selected camera.
- 2
If every camera app is dark, check the manufacturer's exposure/brightness controls where available.
- 3
Compare another USB port/camera only after lighting and settings are ruled out.
A normal live DeviceOK image suggests the camera can produce a usable stream and points toward app-specific processing/settings.
A consistently dark image in multiple apps and lighting conditions should move to model-specific camera settings/support rather than generic driver reinstall lists.