i don't think this is solved.

my monitor webcam was working fine in April/May.  i use no special
drivers, it is a desktop monitor with effectively a USB hub and webcam
built in (so using the standard plug and play UVCVIDEO drivers). It has
now stopped working.

Doesnt show up in Cheese or in Guvcview.


if i run dmesg i get:

[ 7116.802582] usb 2-5.1: Product: Monitor Webcam
[ 7116.802586] usb 2-5.1: Manufacturer: OmniVision Technologies, 
Inc.538-2640-09.07.24.1
[ 7116.804179] uvcvideo: Found UVC 1.00 device Monitor Webcam (05a9:2649)
[ 7116.805930] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. 
Enabling workaround.
[ 7116.806302] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 
26).
[ 7116.806306] uvcvideo: Failed to initialize the device (-5).

physically unplugging and replugging its usb doesnt help.

neither does rmmod uvcvideo and modprobe uvcvideo.

Weirdly, unplugging from my desktop's own USB slots  - which are usb 2
(EHCI) - and moving the monitor usb cable to an empty usb 3.0 (xHCI)
slot fixed the issue!

So i am back in business, but i believe whatever issue keeps popping up
(for different webcams every few kernel releases), is still there...

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https://bugs.launchpad.net/bugs/1881757

Title:
  webcam is detected but not working with kernel 5.4.0.33

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