Arch Linux

Razer(x)

Member

Registered: 2006-08-30

Posts: 109

Monitor cacking sound after some time

Using a monitor with in built speaker as audio output, after sometimes it starts cracking, and i have to kill and restart pulseaudio to make it work again

What could be causing the issue? bitrate?

Last edited by Razer(x) (2020-03-29 11:37:38)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,772

Re: Monitor cacking sound after some time

How does the audio get to the monitor?   Separate audio cables?  with HDMI video?

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Razer(x)

Member

Registered: 2006-08-30

Posts: 109

Re: Monitor cacking sound after some time

How does the audio get to the monitor?   Separate audio cables?  with HDMI video?

From the GPU via Displayport cable

Wild Penguin

Member

Registered: 2015-03-19

Posts: 320

Re: Monitor cacking sound after some time

I seem to get some occasional consistent crackling + hissing + squaking/whistling (the last component of the distortion is difficult to describe) problem in those seldom times, when I want to use my monitor speakers. The audio is still there, just severely distorted in a consistent way. It will go away (well, not always but more often does than doesn't), if I change the audio output away from the monitor and back. Also using DisplayPort, and amdgpu. I haven't investigated any further since I actually don't need the display speakers (I've done this just for testing and for some weird temporary needs I won't go further here). I've reproduced this with different monitors.

It sounds almost exactly like opening a raw audio file in an audio editor with wrong settings, i.e. signed 16-bit as non-signed or something - it's been a long time since I played around with raw audio files (this was back when Win3.11 and 95 were popular, and I was examining some sample files in some games - since then almost anything seems to use audio files with headers; or perhaps the files were proprietary and I had somehow ripped the raw sample data; I don't remember as that was a long time ago ).

But based on that, my (long-shot) guess is: the driver (whoever is responsible for the audio part in the GPU driver) is negotiating a different kind of sample format with the display compared to what is actually being fed to the output (to the display). I.e. it is a bug, in case you have the same issue. In my case I think I'm fairly certain it is not a faulty cable, however generally a bad cable (or a faulty connector) is certainly a possibility. I'm not familiar at all with the sample formats the DP protocol uses, so this is really a long-shot guess.

Last edited by Wild Penguin (2020-03-29 19:03:54)

Razer(x)

Member

Registered: 2006-08-30

Posts: 109

Re: Monitor cacking sound after some time

I seem to get some occasional consistent crackling + hissing + squaking/whistling (the last component of the distortion is difficult to describe) problem in those seldom times, when I want to use my monitor speakers. The audio is still there, just severely distorted in a consistent way. It will go away (well, not always but more often does than doesn't), if I change the audio output away from the monitor and back. Also using DisplayPort, and amdgpu. I haven't investigated any further since I actually don't need the display speakers (I've done this just for testing and for some weird temporary needs I won't go further here). I've reproduced this with different monitors.

It sounds almost exactly like opening a raw audio file in an audio editor with wrong settings, i.e. signed 16-bit as non-signed or something - it's been a long time since I played around with raw audio files (this was back when Win3.11 and 95 were popular, and I was examining some sample files in some games - since then almost anything seems to use audio files with headers; or perhaps the files were proprietary and I had somehow ripped the raw sample data; I don't remember as that was a long time ago ).

But based on that, my (long-shot) guess is: the driver (whoever is responsible for the audio part in the GPU driver) is negotiating a different kind of sample format with the display compared to what is actually being fed to the output (to the display). I.e. it is a bug, in case you have the same issue. In my case I think I'm fairly certain it is not a faulty cable, however generally a bad cable (or a faulty connector) is certainly a possibility. I'm not familiar at all with the sample formats the DP protocol uses, so this is really a long-shot guess.

I think i fixed it changing the scheduling as stated in the pulseaudio section of archwiki