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Dear Ubuntu community,

As a beginner with Ubuntu, I am currently facing some issues with my sound when I try to output it directly on my external screen. What I do is that I connect my screen (HDMI) via an USB-C adapter to my laptop, video works perfectly but audio has some issues. If I don't play any sounds for approximately 10 seconds, I get a unpleasant popping sound. After this happens, if I play any new sound, I get another popping sound in my ears, and the first half-second or so of the sound is cut (both unpleasant and impractical). This does not happen if connect my audio directly to the computer's jack port, or if I use an external simple usb audio card/adapter.

At first glance, I suspect some aggressive power-saving options (even if my laptop is plugged in), with the audio disabling the output when no sound are emitted for a certain period of time. I checked the following settings/parameters:
- In the tlp config file: no power-saving options activated for audio ;
- In alsamixer: auto-mute is disabled ;
- In /etc/modprobe.d/alsa-base.conf: tried to add "options snd-hda-intel power_save=0" ;
- Even tried to force audio powersave to off in /usr/lib/pm-utils/power.d/intel-audio-powersave ;

Now I'm running out of ideas, and I haven't been able to find someone with a similar issue.

My hardware is a Dell XPS 13 9360 laptop, with HDA Intel PCH / Realtek ALC3246 (according to alsamixer). I am currently using Ubuntu 16.04.4.

I would be very thankful if any of you had any idea or suggestion.
09-29-2018, 09:29 AM
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