Linux

C920 is good enough for meetings. I solved the focus problem using the traditional Linux method of writing of udev rule which launches a timer when it's plugged in, which periodically launches a systemd service, which runs a bash script to make sure it self-corrects at least every 5 minutes.

❯ cat /etc/udev/rules.d/90-video4linux-webcam-config.rules
KERNEL=="video[0-9]*", SUBSYSTEM=="video4linux", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="0892", TAG+="systemd", RUN{program}="/bin/systemctl start video4linux-webcam-config@$env{MINOR}.timer" ENV{SYSTEMD_WANTS}="video4linux-webcam-config@$env{MINOR}.timer"

❯ cat /etc/systemd/system/[email protected]
# This file is managed by ansible-video4linux-webcam-config
[Unit]
Description=Periodically restart webcam config service

[Timer]
# Unit= defaults to service matching .timer name
OnActiveSec=30

[Install]
WantedBy=timers.target

❯ cat /etc/systemd/system/[email protected]
[Unit]
Description=Set webcam configs

[Service]
Type=oneshot
ExecStart=/bin/bash -c "/usr/local/bin/video4linux-webcam-config.sh %I"

[Install]
WantedBy=multi-user.target

❯ cat /usr/local/bin/video4linux-webcam-config.sh
#!/bin/bash

if [[ $# -ne 1 ]]; then
  echo "Expected minor device number as sole argument" 1>&2
  exit 1
fi

   v4l2-ctl -d $1 --set-ctrl focus_automatic_continuous=0
  v4l2-ctl -d $1 --set-ctrl focus_absolute=0