Does the sound-card make any popping sounds turning on and off?? I have an older XPS 13-9343 and sadly this was a huge issue with Ubuntu/Linux. It would pop on and off whenever you used audio.
I plug in my speakers through a Thunderbolt dock, and I have not experienced it. It shows as a USB sound output though. Let me know if you would like me to try plugging the speakers in directly to the laptop and rebooting it a couple of times.
Thanks for the info. Yes that would be great if you could check that. My issue was the built-in speakers popping whenever audio stopped and started (sound card turning off and on). It was especially loud and unbearable when using headphones plugged directly in.