this solves my problem: pacmd list-sinks to get list of outputs then pacmd set-sink-port sink.primary_output output-wired_headphone routes audio via jack, and pacmd set-sink-port sink.primary_output output-line also routes audio via jack, but the volume is a bit lower. i guess this is a correct setting. pacmd set-sink-port sink.primary_output output-speaker routes back to speaker. found it by following hints of someone helpful from telegram sailfish chat.