Weird problem with webcam

I have a weird problem with my Logitech C270 webcam.  It has worked well for years, including a lot of video chats recently.  However, a couple of weeks ago, the microphone stopped working.  It doesn't even appear in Pulse Audio.  I then tried it in my ThinkPad, where it again failed.  On the other hand the microphone in my Logitech headset works fine with both computers.  This led me to believe the webcam microphone had failed.  I then bought another C270 and the same thing happens!  I then tried booting the Thinkpad into Windows 10, where the webcam microphone now works.  Any idea why it would fail in openSUSE 15.2, but work in Windows 10 on the same computer? tnx jk