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Microphone not working, or too quiet [Solved]
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erthalion
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Joined: 19 Sep 2012
Posts: 21

PostPosted: Thu Feb 19, 2015 10:13 am    Post subject: Microphone not working, or too quiet [Solved] Reply with quote

Hi everyone! I have a fresh installed Gentoo, but there is a strange problem with microphone - there is no any captured audio nor from arecord, nor from skype-4.3. Sometimes (and I don't know, what I've changed for this) audio can be captured, but it's to noisy and quiet.

Here is information about hardware:

Quote:

# lspci -k | grep Audio -A 2
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
Subsystem: Lenovo Device 3978
Kernel driver in use: snd_hda_intel
--
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
Subsystem: Lenovo Device 3978
Kernel driver in use: snd_hda_intel


Quote:

# arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC3239 Analog [ALC3239 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0


and looks like everything is unmuted:

Quote:

# amixer -c1
Simple mixer control 'Master',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 87
Mono: Playback 73 [84%] [-10.50dB] [on]
Simple mixer control 'Headphone',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 87
Mono:
Front Left: Playback 0 [0%] [-65.25dB] [off]
Front Right: Playback 0 [0%] [-65.25dB] [off]
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 87
Mono:
Front Left: Playback 87 [100%] [0.00dB] [on]
Front Right: Playback 87 [100%] [0.00dB] [on]
Simple mixer control 'PCM',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 255 [100%] [0.00dB]
Front Right: Playback 255 [100%] [0.00dB]
Simple mixer control 'Mic',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 22 [71%] [-1.50dB] [on]
Front Right: Playback 22 [71%] [-1.50dB] [on]
Simple mixer control 'Mic Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 3
Front Left: 3 [100%] [36.00dB]
Front Right: 3 [100%] [36.00dB]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 63
Front Left: Capture 63 [100%] [30.00dB] [off]
Front Right: Capture 63 [100%] [30.00dB] [off]
Simple mixer control 'Auto-Mute Mode',0
Capabilities: enum
Items: 'Disabled' 'Enabled'
Item0: 'Enabled'
Simple mixer control 'Internal Mic Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 3
Front Left: 3 [100%] [36.00dB]
Front Right: 3 [100%] [36.00dB]


I didn't change any configuration files, and everything is ok with playing audio. Can anybody help me to debug this problem?


Last edited by erthalion on Sat Feb 21, 2015 3:07 am; edited 1 time in total
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v_andal
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Joined: 26 Aug 2008
Posts: 543
Location: Germany

PostPosted: Fri Feb 20, 2015 7:45 am    Post subject: Reply with quote

In alsamixer hit F4 and try to enable/increase Mic Boost. Also play with Capture. Normally, it should be enabled (Hit Space when control is selected).

One more thing to check is the tweaks for snd_hda_intel. Read /usr/src/linux/Documentation/sound/alsa/HD-Audio.txt to see if there's anything useful for you.

Though, you should also check your microphone under Windows. I had once a laptop, where microphone was simply bad and didn't want to work with any settings. It did capture sounds, but those were very noisy and low.
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erthalion
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Joined: 19 Sep 2012
Posts: 21

PostPosted: Sat Feb 21, 2015 3:06 am    Post subject: Reply with quote

v_andal, thanks for the reply. I found the source of problem, and the next time I should look at the "amixer" output more carefully)

Quote:
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 63
Front Left: Capture 63 [100%] [30.00dB] [off]
Front Right: Capture 63 [100%] [30.00dB] [off]


So, microphone was unmuted by this command:

Quote:
amixer -c 1 Capture, 0 80% 40% unmute cap
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