Create mono sound option (temp) for hdmi output: -------------------------------------- Terminal: pacmd load-module module-remap-sink sink_name=mono master=alsa_output.pci-0000_01_00.1.hdmi-stereo channels=2 channel_map=mono,mono Then in sys settings: mono option should be there until under independent devices of the audio section restart reference: https://superuser.com/questions/657876/mono-sound-output-in-ubuntu Origonal date from Vivaldi: 17 July 2018 @ 18:43