[alsa-devel] A problem about two microphones
Recently we met a problem, on a lenovo machine, it has two microphones(one is microphone, the other is headset-mic), and both of them are located in the front panel.
When the driver assigns names for them (via the function hda_get_autocfg_input_label()), they are assigned the same name "Mic" since they have the same location. So there are two "Mic", but the pulseaudio can't handle two "Mic", in the pulseaudio, it can only handle multiple inputs/microphones with different names, like "Mic" and "Front Mic". If two microphones have the same name, we can only see one of them through pulseaudio.
I don't know how to solve this problem, the simplest way to workaround it I can figure out is to change one of the microphone's location, let them have differnt location, then they have differnet names. Pin Default 0x02a19040: [Jack] Mic at Ext Front Changed to: Pin Default 0x04a19040: [Jack] Mic at Ext Right
Do you have any ideas to solve this problem?
The alsa-info.txt for this machine is at: http://paste.ubuntu.com/24967758/
Thanks,
Hui.
On Thu, 06 Jul 2017 04:09:07 +0200, Hui Wang wrote:
Recently we met a problem, on a lenovo machine, it has two microphones(one is microphone, the other is headset-mic), and both of them are located in the front panel.
When the driver assigns names for them (via the function hda_get_autocfg_input_label()), they are assigned the same name "Mic" since they have the same location. So there are two "Mic", but the pulseaudio can't handle two "Mic", in the pulseaudio, it can only handle multiple inputs/microphones with different names, like "Mic" and "Front Mic". If two microphones have the same name, we can only see one of them through pulseaudio.
I don't know how to solve this problem, the simplest way to workaround it I can figure out is to change one of the microphone's location, let them have differnt location, then they have differnet names. Pin Default 0x02a19040: [Jack] Mic at Ext Front Changed to: Pin Default 0x04a19040: [Jack] Mic at Ext Right
Do you have any ideas to solve this problem?
As you noticed, an easy fix would be to fake the front mic by adjusting the pin config. It's more or less acceptable, IMO. It'd be OK by adding a proper comment explaining the situation.
Another option would be to rename the kctls later as you like. If PA works no matter which string prefix is, it's also an acceptable workaround, but I guess this would be come bigger changes than the above although it achieves an almost same result.
Or fix PA, it's a better one for kernel side ;)
thanks,
Takashi
On 07/06/2017 03:40 PM, Takashi Iwai wrote:
On Thu, 06 Jul 2017 04:09:07 +0200, Hui Wang wrote:
Recently we met a problem, on a lenovo machine, it has two microphones(one is microphone, the other is headset-mic), and both of them are located in the front panel.
When the driver assigns names for them (via the function hda_get_autocfg_input_label()), they are assigned the same name "Mic" since they have the same location. So there are two "Mic", but the pulseaudio can't handle two "Mic", in the pulseaudio, it can only handle multiple inputs/microphones with different names, like "Mic" and "Front Mic". If two microphones have the same name, we can only see one of them through pulseaudio.
I don't know how to solve this problem, the simplest way to workaround it I can figure out is to change one of the microphone's location, let them have differnt location, then they have differnet names. Pin Default 0x02a19040: [Jack] Mic at Ext Front Changed to: Pin Default 0x04a19040: [Jack] Mic at Ext Right
Do you have any ideas to solve this problem?
As you noticed, an easy fix would be to fake the front mic by adjusting the pin config. It's more or less acceptable, IMO. It'd be OK by adding a proper comment explaining the situation.
Another option would be to rename the kctls later as you like. If PA works no matter which string prefix is, it's also an acceptable workaround, but I guess this would be come bigger changes than the above although it achieves an almost same result.
Or fix PA, it's a better one for kernel side ;)
OK, got it. Since there is only one machine having this problem, let us use the simplest way to workaround it. And I guess it is very rare that machines have multiple Front Mic or Rear Mic in reality. If we have more machines having this problem, let us start to try a general solution then.
Thanks, Hui.
thanks,
Takashi
participants (2)
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Hui Wang -
Takashi Iwai