I'm on a Dell Inspiron 14-3442 with Kubuntu 20.04.
Whenever I launch cheese (or similar programs), the light on the webcam lights up, but no images were sent back.
I suppose that 0c45:670b is the camera, but it seems that this has been supported in the kernel since the 2.x era.

Most information, including diagnostic output, are posted on https://askubuntu.com/questions/1358824/integrated-webcam-is-not-sending-back-image