There are a couple mixer controls that you can try adjusting:
Simple mixer control 'Headphone Jack Sense',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off]
Simple mixer control 'External Amplifier',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on]
There are a couple mixer controls that you can try adjusting:
Simple mixer control 'Headphone Jack Sense',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'External Amplifier',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]