No. It IS kernel-hardware problem. Very singular - creative and derivates. On 
my laptop (Acer V5-131)the  integrated camera works normally despite of the new 
kernel (-s, because it was many of them I've tried). So it is the new kernel 
which doesn't recognize specific hardware driver. (With the new kernel I have 
no folder "/dev/vl4/ which comprise hardlinks to the kernel's driver. It is 
present with the old one)
My problem is similar to your problem. As a teacher I have to use my camera for 
my work and I have no MS Windows so without camera I'm done with my work. The 
solution I took right now is to roll back to the kernel #5.4.0-91 - the last 
which works with my camera. I froze all updates of the kernel and I can work. 
Unfortunately I didn't find another solution :(

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https://bugs.launchpad.net/bugs/1957112

Title:
  webcam doesn't work

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