markstos OP , 1 month ago

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.

<span style="color:#323232;">❯ cat /etc/udev/rules.d/90-video4linux-webcam-config.rules
</span><span style="color:#323232;">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"
</span>

<span style="color:#323232;">❯ cat /etc/systemd/system/[email protected]
</span><span style="color:#323232;"># This file is managed by ansible-video4linux-webcam-config
</span><span style="color:#323232;">[Unit]
</span><span style="color:#323232;">Description=Periodically restart webcam config service
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Timer]
</span><span style="color:#323232;"># Unit= defaults to service matching .timer name
</span><span style="color:#323232;">OnActiveSec=30
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Install]
</span><span style="color:#323232;">WantedBy=timers.target
</span>

<span style="color:#323232;">❯ cat /etc/systemd/system/[email protected]
</span><span style="color:#323232;">[Unit]
</span><span style="color:#323232;">Description=Set webcam configs
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Service]
</span><span style="color:#323232;">Type=oneshot
</span><span style="color:#323232;">ExecStart=/bin/bash -c "/usr/local/bin/video4linux-webcam-config.sh %I"
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Install]
</span><span style="color:#323232;">WantedBy=multi-user.target
</span>

<span style="color:#323232;">❯ cat /usr/local/bin/video4linux-webcam-config.sh
</span><span style="color:#323232;">#!/bin/bash
</span><span style="color:#323232;">
</span><span style="color:#323232;">if [[ $# -ne 1 ]]; then
</span><span style="color:#323232;">  echo "Expected minor device number as sole argument" 1>&2
</span><span style="color:#323232;">  exit 1
</span><span style="color:#323232;">fi
</span><span style="color:#323232;">
</span><span style="color:#323232;">   v4l2-ctl -d $1 --set-ctrl focus_automatic_continuous=0
</span><span style="color:#323232;">  v4l2-ctl -d $1 --set-ctrl focus_absolute=0
</span>