The last fix also broke v4l2loopback for me. Most applications seem to
check the V4L2_CAP_VIDEO_CAPTURE flag (eg Firefox:
https://hg.mozilla.org/releases/mozilla-
release/file/aac9479c6a32ce3b95556da24f3b00c00e145506/media/webrtc/trunk/webrtc/modules/video_capture/linux/device_info_linux.cc#l386),
which is now unset by the fix. This means apps such as Firefox do not
detect virtual cameras created by v4l2loopback with this patch.

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https://bugs.launchpad.net/bugs/1899633

Title:
  Repeated kernel warnings/stacktraces with kernel 5.4 and newer

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