CEC via HDMI connect

Hi there
Please can someone advise how I modify the config file on a RP4 , so that when I hit the play button on the Volumio application, the TV (hdmi connected) will switch on ?
Many thanks All

please note that sudo apt upgrade will break volumio
and sudo apt update will not break

so don’t use upgrade commands .

Be aware that on the Raspberry Pi 4 only the HDMI plug next to the USB-C will work with cec commands.

Great, many thanks, will give it a try