I have installed CentOS 6.5 on a Dell Insperion with an Intel chip. I first noticed that my microphone is not working on Skype on CentOS although it was working fine with Windows 7 on the same box. The speakers work fine on both operating systems. I did the following test.

arecord -vv -d 10 test.wav
aplay -vv test.wav

and did not get any sound played back. I went to System:Preferences:Sound to get the Sound Preferences dialog. I went to the Input tab and "Microphone" was selected as the connector. I turned the input volume up to maximum and spoke into the microphone but the "Input level" boxes all remained a light grey like it was disabled. The only option for "Choose a device for sound input" is "Internal Audio Analog Stereo".

  • CentOS 6.5 has a very outdated kernel which means the mic might not work because your kernel sound drivers don't talk to your hardware properly. I can't say for sure that's the case but it's very likely. – Artem S. Tashkinov Jun 29 at 20:08
  • Thank you for the reply. I now use CentOS 7.8 and have no problems with the microphone or speakers. Thanks, – OtagoHarbour Jun 29 at 22:07

Try install pavucontrol.

yum install pavucontrol

After installation, from menu open PulseAudio Volume Control

Here the input devices will be detected. The built-in volume control seem to face some problem. It worked for me.

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