[Bug 245507] multimedia/webcamd: webcam stops working after some time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245507

            Bug ID: 245507
           Summary: multimedia/webcamd: webcam stops working after some
                    time
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: hselasky at FreeBSD.org
          Reporter: jrm at freebsd.org
          Assignee: hselasky at FreeBSD.org
             Flags: maintainer-feedback?(hselasky at FreeBSD.org)

This is on a Lenovo X220 running 12.1.

% webcamd -l | grep Camera
webcamd [-d ugen0.3] -N Chicony-Electronics-Co---Ltd--Integrated-Camera -S
unknown -M 0

% sudo service webcamd start
Starting webcamd.
Attached to ugen0.3[0]

% pwcview -s vga
Webcam set to: 640x480 (vga) at 5 fps

Normally this works, but something gets triggered, so that this only brings up
a green screen and the LED on the webcam is not lit up.  I've tried restarting
webcamd, reloading the cuse kernal module and

% sudo usbconfig -d ugen0.3 power_off
% sudo usbconfig -d ugen0.3 power_on

The only way to stop pwcview is to send a kill signal.  This text is then
reported:

Webcam set to: 640x480 (vga) at 5 fps
^Clibv4l2: error dequeuing buf: Device not configured
Error reading from webcam: Device not configured

A wild guess is that some process is blocking something, but I have yet to find
a culprit.

I believe the only fix is to restart the laptop.  I will confirm this later.

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