If your system has a dedicated headphones jack, it may be auto-muted by default..
Type:
$ mixerctl -a | grep headphones
If outputs.headphones.mute is "on", set it to "off", and attempt to adjust the volume if it's too low.
Note, If this is the headphones jack on your CD/DVD-ROM drive, make sure you connected the internal analog audio cable to your sound card.
Hope that helps.
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