I have (Ubuntu 18.04) also a spamming on /var/log/syslog, like:

Aug 28 12:01:13 pern kernel: [ 4554.463716] uvcvideo: Failed to query (GET_DEF) 
UVC control 2 on unit 1: -32 (exp. 1).
Aug 28 12:01:13 pern kernel: [ 4554.464089] uvcvideo: Failed to query (GET_DEF) 
UVC control 2 on unit 1: -32 (exp. 1).
Aug 28 12:01:13 pern kernel: [ 4554.464464] uvcvideo: Failed to query (GET_DEF) 
UVC control 2 on unit 1: -32 (exp. 1).
Aug 28 12:01:13 pern kernel: [ 4554.464878] uvcvideo: Failed to query (GET_DEF) 
UVC control 2 on unit 1: -32 (exp. 1).

...which is not shut off by the debug=0 (at least, that seems to me, I
have not tested extensively)

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https://bugs.launchpad.net/bugs/811604

Title:
  uvcdynctrl spams uvcdynctrl-udev.log and fills up filesystem

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