Kernel config and HDMI

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

Hi,
I would like to use the utility pactl to change the audio output device from CLI.

Until a couple of months ago it was working as expected, unfortunately I can not define exactly what is the difference.

If I type:

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

I have tried:

Code:

$ echo "options snd_hda_intel index=1,0" > /etc/modprobe.d/alsa-base.conf

Code:

$ diff /etc/pulse/default.pa
< load-module module-udev-detect
---
> load-module module-udev-detect tsched=0

- Commenting "load-module module-switch-on-port-available" in /etc/pulse/default.pa

but nothing is changed.

This is the list of modules loaded:

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

Seems to be a kernel configuration issue, with gentoo-kernel-bin works expected.
How can I check which config options should I check?

Thanks

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

If I try to grep the Audio devices I get:

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

I manage to get mpv working.
The following allows to get a list of audio devices:

poe_1957 · Posted: Mon Nov 30, 2020 11:51 am Post subject: my 2 cents

DId you check alsamixergui ?
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Banana · Veteran Joined: 21 May 2004 Posts: 1392 Location: Germany

Or just alsamixer if the gui command does not exist
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PFL - Portage file list - find which package a file or command belongs to.

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

So alsamixer returns 4 cards:
1. (default)[/code] that is pulseaudio
2. HDA Intel HDMI that has 5 S/PDIF
3. HDA Intel PCH that has Master/Headphone/Speaker/PCM/...
4. HDA NVidia that has 4 S/PDIF

even if I try to change the sound card with "F6" the output sound does not change.
And got the same behavior in mpv.

poe_1957 · Posted: Sat Dec 05, 2020 3:19 pm Post subject: Alsmixer

If one is working then the other ways of decoding do not work.

for example if the analog audio is working the digital audio does not work. You have to switch manually.
Also check if your headphone is not connected.

Sound volume is not muted etc on each channel.
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yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

I am not sure what do you mean by "for example if the analog audio is working the digital audio does not work. You have to switch manually.". How can switch it?

There is no headphone connect, just the displayport to hdmi cable.

I do not think is a problem of muting as when I select the pulse/alsa_output.pci-0000_00_03.0.hdmi-stereo output the video freezes in mpv

poe_1957 · Posted: Sun Dec 06, 2020 5:00 pm Post subject:

Even if you have no headphone connected to it your motherboard has probably a socket for headphones or analog output besides HDMI. Look for red, green, connectors ;-)

You switch it in KMIX on your desktopbar if you have KDE desktop. ( you have 2 icons then).
On other desktops it will be a similar option in your audiocontrol application.
You might be missing a software application that you need to install if you cannot do it. Anyway that is the way forward.
Currently there is a problem with the alsamixergui. It does not compile due to a illegal converting from string to char issue.
What also helps : instead of putting it as a module put everything in the kernel. <*> instead of <M>.
That may also be a problem : everything as a module or everything included.
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yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

I am using sway on pure wayland.
The problem is that it works if I use the gentoo-kernel-bin, so it is definitely related to my kernel config.
I have tried to compile a kernel with make allmodconfig, but it will just kernel panic on boot.

poe_1957 · Posted: Sun Dec 06, 2020 6:09 pm Post subject:

Yes, wayland is a problem. Too much loose ends to me. Still experimental.
I stay with X11 and KDE. I recently switched to SYSTEMD. It works but if it fails...
New software is not so stable as it used to be.
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yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

Recently I was not able to having audio over HDMI, to make it works I have to comment the entire content of /etc/modprobe.d/alsa.conf.
But the sound is crackling any suggestions?

Thanks

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

After a long time I have decided to have another look at this.
I have tried to enable:

yellowhat · Guru Joined: 10 Sep 2008 Posts: 528

Another small update.
I have noticed that if I apply the following changes:

< # CONFIG_SND_DEBUG is not set
---
> CONFIG_SND_DEBUG=y
> CONFIG_SND_DEBUG_VERBOSE=y
> CONFIG_SND_PCM_XRUN_DEBUG=y
> CONFIG_SND_CTL_VALIDATION=y
> CONFIG_SND_JACK_INJECTION_DEBUG=y

Wait about 90 seconds after boot (do not ask me how I find out, took many many trials), audio over display port works as expected.

Am I missing something in my config?
Is this related to nouveau?