Debian 8 Microphone No sound resolution process __debian

Hardware configuration: ThinkPad e545 20B20007CU external headset + mike

Software Environment: KDE Desktop has been installed alsa-utils alsa-base PulseAudio pulseaudio-utils pulseaudio-module-x11

Somehow, the microphone suddenly no sound, I in the kmix for a long time, just do not know where the problem. There are no devices in the list for audio input.

Online search for some solutions, most will introduce new problems, do not want to try. decided to grope for himself.

Begin to suspect it's a alsa question, and then enter the command

Aptitude purge Alsa-utils Alsa-base; Aptitude Install Alsa-utils Alsa-base

The problem has not been solved. See Kmix supported hardware that has PulseAudio alsa OSS Mpris2, and is currently using PulseAudio. Search separately, found Mpris2 is not commonly used, by

Https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture_ (%e7%ae%80%e4%bd%93%e4%b8%ad%e6%96%87)

Knowing that the OSS is older does not apply and is going to replace PulseAudio with ALSA so I uninstall and clear the settings

Aptitude Purge PulseAudio Pulseaudio-utils pulseaudio-module-x11

After restarting the computer, the problem still remains unresolved.

Https://wiki.archlinux.org/index.php/PulseAalsaudio_ (Simplified Chinese)

Knowing that PulseAudio to use with ALSA, I

Aptitude Install PulseAudio Pulseaudio-utils pulseaudio-module-x11

Restart the computer again, the problem is solved.

Reflection: May accidentally change the PulseAudio settings, revert to the default is normal.