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My issue is that I am getting a high pitched noise from my speakers. When I connect my laptop to my Toshiba 32L2300U and then play any form of audio or dial the volume bar, I will hear a high pitched noise coming from my TV.

The high pitch sound persists and the only way to shut it off is to mute my TV not my laptop. When I boot my laptop to windows this problem does not occur. I found that this issue only occurs when I boot Ubuntu when connected to my TV.

I have tried turning the PCM output volume from merge to ignore and then rebooted the system but no change. I am not sure what the problem is, but I believe it is an ubuntu problem. I also have version 18.04 of Ubuntu. (edit: the noise does not happen when I use my laptop speakers, it only happens when I use my TV speakers)

FranticCelery
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1 Answers1

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At first I thought it was only 4.15.0-33 kernel but yesterday I noticed it briefly in Windows 10 too. Again it happened on the secondary TV When signing in via Chrome to a password enabled website.

Then today under Kernel 4.13.0-36 I noticed system notification sound for volume change (that popping bubble sound) was coming from second TV driven by Intel HD 530 over USB-C Thunderbolt Display Port to HDMI converter whilst real sound internet video / news channels were coming from main TV driven by nVidia.

So I did a quick screenshot so you could see the setup:

App sound to nVidia and system sound to intel.png

I am using a special kernel module for nVidia sound due to newer Dell Laptops powering off the sound card in newer nVidia Cards to save 5 watts of electricity: https://github.com/hhfeuer/nvhda (not the exact github link but close enough).

Hopefully this helps. If not yourself then others at least.

Community
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WinEunuuchs2Unix
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