It looks like you have some controls muted/off that shouldn't be.
Try going into alsamixer and unmuting them:
Simple mixer control 'Speaker',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Post Mixer Speaker Playback DRC switch',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'rt1318 DAC',0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [off]
Front Right: Playback [off]
Simple mixer control 'rt1318-1 DAC',0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [off]
Front Right: Playback [off]
Simple mixer control 'rt1318-2 DAC',0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [off]
Front Right: Playback [off]
** Changed in: alsa-driver (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/2159584
Title:
[Dell XPS 13 9350] Audio stopped working, now "Dummy Output" only
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