The headphone volume is set to 0. Try turning that up in alsamixer.

Card sysdefault:1 'Generic_1'/'HD-Audio Generic at 0xc06c0000 irq 66'
  Mixer name    : 'Cirrus Logic CS8409/CS42L42'
  Components    : 'HDA:10138409,10280a12,00100100'
  Controls      : 13
  Simple ctrls  : 6
Simple mixer control 'Headphone',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback -63 - 0
  Mono:
  Front Left: Playback -63 [0%] [-99999.99dB]
  Front Right: Playback -63 [0%] [-99999.99dB]

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https://bugs.launchpad.net/bugs/2105504

Title:
  i'm unable to use wired earphones. evertime I try plug it in, it
  crashes, also disabling laptop speakers.

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