etc/systemd/system/fix-f4-led.service


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# Enable with
# systemctl enable --now fix-f4-led.service
[Unit]
Description=Fix F4 LED on Thinkpad

[Service]
Type=oneshot
ExecStart=/bin/sh -c "echo 0 > /sys/class/leds/platform::micmute/brightness"

[Install]
WantedBy=multi-user.target