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From: Michael <confabulate@kintzios.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] OSS4
Date: Mon, 13 Apr 2020 18:51:46 +0100
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On Monday, 13 April 2020 18:09:25 BST Jorge Almeida wrote:
> On Mon, Apr 13, 2020 at 4:29 PM Michael <confabulate@kintzios.com> wrote:
> > Yes, the first step would be to reduce or set to zero the Mic Boost in
> > alsamixer and adjust the Capture volume. However, noise with arecord is
> > usually a result of incorrect bitrate?
> >
> > You could try:
> >
> > arecord -fdat -r 48 test.wav
>
> OK, I tried "arecord -D hw:0,1 -fdat -r 48 test.wav" and "arecord -D
> hw:0,2 -fdat -r 48 test.wav". aplay produces noise, in both cases. I
> alse tried with -r 44, same result.
>
> ## arecord -l
> **** List of CAPTURE Hardware Devices ****
> card 0: PCH [HDA Intel PCH], device 0: Generic Analog [Generic Analog]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
> card 0: PCH [HDA Intel PCH], device 2: Generic Alt Analog [Generic Alt
> Analog] Subdevices: 1/1
> Subdevice #0: subdevice #0
I can't see your USB mic anywhere ...
Both device 0 and device 2 are on the *same* card. I would think an external
device as you posted previously would register on the kernel as a separate
card.
Is dmesg recognising your USB mic when you plug it in?
Do you need some additional driver for it?
Is there some On/Off button on it you need to turn it on with?
> ## arecord -L
> null
> Discard all samples (playback) or generate zero samples (capture)
> default:CARD=PCH
> HDA Intel PCH, Generic Analog
> Default Audio Device
> sysdefault:CARD=PCH
> HDA Intel PCH, Generic Analog
> Default Audio Device
> front:CARD=PCH,DEV=0
> HDA Intel PCH, Generic Analog
> Front speakers
> usbstream:CARD=PCH
> HDA Intel PCH
> USB Stream Output
Hmm ... I assume "USB Stream Output" is the USB mic, but I'm not sure and the
Output part confuses me.
> I assume the two capture devices are LineIn and Mic (mono). Correct?
> (But why the device numbers 0 and 2, and not 1?)
> OTOH,
> ## arecord -fdat -r 48 test.wav
> ALSA lib
> /var/tmp/portage/media-libs/alsa-lib-1.2.1.2/work/alsa-lib-1.2.1.2/src/pcm/
> pcm_dsnoop.c:641:(snd_pcm_dsnoop_open) unable to open slave
> arecord: main:828: audio open error: No such file or directory
>
> I didn't use any flags for aplay, because aplay foo.wav works fine
> when foo.wav is music from a CD (i.e., not from a micro)
>
> > Also, make sure any hardware buttons have been enabled and the mic is not
> > muted. Additional options may be required to use the correct input device
> > and driver, which can be specified in /etc/modprobe.d/alsa.conf
>
> I have /etc/modprobe.d/alsa.conf (not changed) but I have alsa support
> built in the kernel, not as a module (could this be a problem?!)
>
> Jorge
Years ago I was having problems with alsa. Audio drivers were not as polished
as they are today for Linux. Anyway, I remember contacting some dev who asked
me to rebuild my kernel with alsa as modules and run 'alsactl init', which
would only produce a full output this way. I don't know if this would still
be a problem today and anyway you are not experiencing the same bugs I was
troubleshooting 15 years ago.
So, in the first instance I would look at a USB driver, if needed, from the
output in dmesg.
lsusb -v would also show any
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
and any fields showing "Microphone".
Finally, have a look under 'cat /proc/bus/input/devices' or similar for any
USB devices, to find out what driver it is using.
HTH.
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