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Microphone not picking any sound -- Debian Testing/Wheezy (KDE 4.6.5)

February 23rd, 2012 - 06:50 am ET by Arun Khan | Report spam
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Debian Wheezy AMD 64 weekly build 13/Feb/2012
KDE 4.6.5 (default) desktop
Kernel 3.2.0 (stock from the weekly build)
on Toshiba C640 laptop.

alsamixergui shows - audio device is shown as Intel Conexant CX20590.
I can hear sound from the built in speakers as well as from the head phone jack.
Through Kmix gui, I have boosted the Mic to 40dB.

However, the mic does not pick up anything. I am unable to use
services like linphone and skype.

FWIW, in KDE>System Settings>Sound and Video Configurations> Device
Preference> Audio Capture
Communications shows the "test" button greyed out whereas the same
system when I boot with Linux Mint 12 KDE RC (Live Session), the
button is not greyed out.

Any pointers to get the MIC input working highly appreciated.
Arun Khan


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#1 Julien Claassen
February 23rd, 2012 - 07:20 am ET | Report spam
Hello Arun!
Sometimes in laptops, the microphone might be coupled with line-in. Have you
had any mic luck under Linux with this laptop? You might have a look in
alsamixer or alsamixergui for line-in settings as well and you might test it,
by plugging in an external mic, or if it's switched, you might just plug any
cable in - a headphone should do - and then unplug it. I have seen a
soundcard, which would switch internal mic and line-in, depending on a plug
being in the line-in jack. Sometimes, these things don't really work under
Linux.I don't know about your particular card though. My second hand
experience was mainly with macbooks.
I hope that helps.
Warm regards
Julien

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