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I got a microphone connected via a XLR adapter to the rear mic jack of my mainboard. The audio dialog of KDE seems to detect that, as does not mark it as not connected (which it does for the front mic and line in). But selecting the audio device as source does not produce any useful sound.
What makes you sure that the mic work, you may ask? If I enable the loopback in alsamixer (and pump up the boost), it works. Unfortunately, that is the only way I can get sound out of that.
It seems, as if the system realizes two possible sources from the audio device. But there is no option GUI wise where I can select the second input to test if that helps.
alsactl info
#
# Sound card
#
- card: 0
[....]
#
# Sound card
#
- card: 1
id: Generic
name: HD-Audio Generic
longname: HD-Audio Generic at 0xba600000 irq 68
driver_name: HDA-Intel
mixer_name: Realtek ALC1220
components: HDA:10ec1168,10438724,00100003
controls_count: 47
pcm:
- stream: PLAYBACK
devices:
- device: 0
id: ALC1220 Analog
name: ALC1220 Analog
subdevices:
- subdevice: 0
name: subdevice #0
- device: 1
id: ALC1220 Digital
name: ALC1220 Digital
subdevices:
- subdevice: 0
name: subdevice #0
- stream: CAPTURE
devices:
- device: 0
id: ALC1220 Analog
name: ALC1220 Analog
subdevices:
- subdevice: 0
name: subdevice #0
- device: 2
id: ALC1220 Alt Analog
name: ALC1220 Alt Analog
subdevices:
- subdevice: 0
name: subdevice #0
hwdep:
- device: 0
id: HDA Codec 0
name: HDA Codec 0
iface: 16
[...]
arecord -l Do 14 Dez 2023 14:53:16 CET
**** List of CAPTURE Hardware Devices ****
[...]
card 1: Generic [HD-Audio Generic], device 0: ALC1220 Analog [ALC1220 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Generic [HD-Audio Generic], device 2: ALC1220 Alt Analog [ALC1220 Alt Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
[...]
Does anyone have any clue what I could do to use that mic?
I think that I have an answer for you.
From the other comments, it sounds like you're using a dynamic mic. So, you can very likely rule out phantom power as, while they may exist, I'm not aware of any dynamic mics that use phantom power.
Additionally, from your original post, you note that you are using an XLR to phono adapter to connect and can get some signal, if you crank up the boost.
Are you by chance running direct from the mic to the on-board soundcard?
If so, that is probably your issue. The mic-in on most non-audio production soundcards isn't designed for this. They are intended for things like electret condensor mics that have built-in pre-amps or others that produce a signal that is closer to line-level.
Most stage and studio mics that use XLR connections produce a very low signal that is intended to run through a pre-amplifier to bring it up to line-level before it goes to tape/DAW/PA power amp.
So, my recommendation would be to take one of two routes:
Obtain a mic pre-amp and add it to your signal chain between the mic and computer.
Obtain an audio interface that contains a decent mic pre-amp.
I would recommend the second, if practical as the ADCs in on-board soundcards are historically mediocre to poor. You will probably be much happier with the result.