CM4 speaker enable: devterm-audio-patch and GPIO 523
On a CM4 the speaker amplifier is switched on by the devterm-audio-patch package; if it goes quiet, reinstall the package or drive GPIO 523 high from rc.local.
What it takes
- Config change
Difficulty 1 of 3 — easy.
Details
Minaz's speakers died after a Kodi/VLC install while the headphone jack kept working; Rex's fix was sudo apt reinstall devterm-audio-patch and a reboot, which another owner confirmed. The package is what raises the amplifier enable line at boot.
The manual equivalent, from libbkmz's CM5 thread: echo 523 > /sys/class/gpio/export, set its direction to out and its value to 1, run from /etc/rc.local — useful on images without the ClockworkPi packages. On the CM5 the same pin is GPIO 580 and the audio also needs a dtoverlay; see the CM5 entry.