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=== Troubleshoot: Microphone detected but can't change volume in Mint Linux ===You open pulseaudio in Linux Mint and the Microphone audio device under "Input" is displayed, however, the slider is grayed out. Can apply to Linux Mint 18.x - 20.x Try to clear the settings in the ~/.config/pulse directory. Delete all of the directory contents (rm * but not rm -r *). Once all the files in that folder are gone execute the following command at the cli: pulseaudio -kNow reboot and see if you have control over the microphone slider. * credit: This tip provided by user [https://forums.linuxmint.com/viewtopic.php?t=225081 trytip over at linuxmint.com]