I observe this on my XPS 13 9360.  
As mentioned by others, the headphone hissing goes away when I mute the system 
or when I run "amixer -c0 sset 'Headphone Mic Boost' 10dB".  I created an even 
in /etc/acpi/events to call run this whenever headphones are inserted so that 
it persists after reboot.

Has anyone had luck advising Dell of the suspected hardware issue?

James

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https://bugs.launchpad.net/bugs/1654448

Title:
  Dell XPS 13 9350/9360 headphone audio hiss

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