It says no audio device is installed when I plug in my c920 logitech camera

Please see this page for a solution. I can confirm it works for solving the issue with a c920 on Windows 11.

I can confirm I have just done this (with a C922 pro) and it seems to be a fix.

To give more context from my limited understanding: something in the webcam settings interferes with the Windows Audio service, which shuts down. I have done a LOT of messing about with drivers, switching the normal speakers and mic to "generic software device" and uninstalling, disabling and reinstalling the webcam drivers. It is possible to get a temporary fix this way, but every time you restart, you will have to go through the process again.

The key part from the solution linked above is turning off the sound enhancements in the webcam. All of the rest is clever work with the Windows Audio service to get it to appear so you can change that setting. Now the drivers for the webcam and the other devices don't clash, and the Windows Audio service is running fine.

Ironically, I started having this issue when I got a new laptop. The old one was a HP Omen running Windows 11. The new one is also a HP Omen running Windows 11, but a faster, newer, shinier version. This would seem to be an easy fix for Logitech if they could switch off the sound enhancements as default.

Ok. Thanks. I'll wait.

I'm afraid I'm running out of ideas. Let's ask other advisors.

They will reply on this thread. I'm sorry I could not help much.

Your patience will be highly appreciated.

Hello, My name is Erfan. I will help you with this.

I understand how frustrating it is. Please try the below steps.

Unplug the webcam and plug in another USB port.

Reinstall driver

1. Press the Windows key + X and select Device Manager.
2. Expand the Camera and Audio section.
3. Right-click on your webcam and audio driver and select Uninstall device.
4. Restart your computer and Windows will automatically reinstall the driver.
5. If that does not help, download latest driver from the Logitech website.

Restart Audio Services

1. Press Win + R to launch the Run command box. Type services.msc and hit the Enter key.
2. Scroll down and find Windows Audio and Windows Audio Endpoint Builder services in the Services panel.
3. If they are not running, right-click on the service and select the start option from the context menu.
4. Repeat the above step for all services containing the word " Audio" in them. Exit the services panel.

Check for Windows updates. Settings(Win+I) > Windows update > Check for Windows update.

After installing the pending updates and restarting the computer, return to the exact Windows Update screen, click Advanced Options > Optional Updates, apply the optional updates, and restart the PC.

Let me know if that did not help. Thank you.