[Howto] disable HDMI sound without pulseaudio etc (using Alsa)

[gor9]

For those using pulseaudio there is a graphical way of disabling hdmi. Never used pipewire.
eg pavucontrol gives you the option to disable hdmi. I do not need pulseaudio or pipewire so ....

I create a file with root powers so that

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cat /etc/modprobe.d/sound.conf 
options snd-hda-intel enable=0

and I know my sound module because I have previously run as a local user

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lsmod | grep snd

Then to see if there is an option of "enable" as local user I run

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modinfo snd_hda_intel | grep enable
parm:           enable:Enable Intel HD audio interface. (array of bool)
parm:           enable_msi:Enable Message Signaled Interrupt (MSI) (bint)

If that is not your sound module, change the module to yours to check if interested.

on full reboot, aplay changes from showing index=0 for hdmi and index=1 for analog to only

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aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Generic [HD-Audio Generic], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

2) If I needed another option maybe because the holes (stacks) or mic is wrong I would go
to the codec page, if it exists and append to my sound.conf "model=string"
eg model=inv-dmic if that was an issue for me. YMMV.

https://www.kernel.org/doc/html/v4.14/s ... odels.html

3) now the config file is saying this...
on boot up....for index=0, disable it as 0 means off
-> once disabled the analog sound device can now grab index=0

If my config was enable=0,0 then I would disabling both internal devices.

Hope that helps alsa users.

I searched before posting and noticed that Huckleberry Finn know of this config
https://forum.mxlinux.org/viewtopic.php ... 51#p683151