Weird. I've had an XPS 9360 running ubuntu since November 2017. Last
week I picked up all the updates from August, rebooted and ran straight
into this bug with headphones that had previously been fine. I dual boot
into Windows and that is fine so it isn't a hardware problem.

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  Dell XPS 13 9350/9360 headphone audio hiss

Status in Dell Sputnik:
Status in alsa-driver package in Ubuntu:
Status in linux package in Ubuntu:
  Won't Fix
Status in pulseaudio package in Ubuntu:

Bug description:
  Pertaining to 16.04 on a dell XPS 13 9360

  ii  alsa-base                                     1.0.25+dfsg-0ubuntu5

  Advanced Linux Sound Architecture Driver Version k4.4.0-57-generic.

  When headphones are plugged in, there is a clearly audible hiss (white 
noise). This is present as soon as the headphones are plugged in, whether 
'headphones' or 'headset' are selected from the pop-up box. 

  Using alsamixer to debug the issue reveals that it is related to
  "Headphone Mic Boost" - the default setting is: dB gain 0.00, 0.00. If
  this is changed to:

  10.00, 10.00 (one notch up) the hiss disappears. 
  20.00, 20.00 cause a louder hiss and 
  30.00, 30.00 causes an even louder hiss with high frequency audio artifacts. 

  When the headphones are removed and plugged back in the Headphone Mic
  Boost setting returns to dB gain 0 and the problem also returns.

  This (problem and workaround) has been reported in the wild: and
  for example

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