Backlight not turning off when screen saver triggers

The Systeminfo plugin shows the firmware version.

Regarding updating: I did update a Pi4 only once and do not remember the steps in detail, just that I did it from Raspberry Pi OS not from Volumio. Edit: Not sure, but probably I followed https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#rpi-eeprom-update.

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