Fixing the Non-Working Thinkpad T510i Mic Mute Button on Ubuntu MATE 17.04

So, apparently, the mic mute button stopped working in Ubuntu. I remember it working in Ubuntu 16.04 but not 17.04. Anyways, I fixed it with this simple instruction from a user on AskUbuntu.

https://askubuntu.com/questions/125367/enabling-mic-mute-button-and-light-on-lenovo-thinkpads

This is what I did to fix the mic mute button on the Thinkpad T510i. The LED on it works now too. If you have a different Thinkpad, I suggest following the full tutorial on the AskUbuntu link above.

Anyways, this is what I did:

Created the file /etc/acpi/events/lenovo-mutemic

with the contents:

event=button/f20 F20 00000080 00000000 K
action=/etc/acpi/lenovo-mutemic.sh

Created the file /etc/acpi/lenovo-mutemic.sh

with the contents:

#!/bin/bash
INPUT_DEVICE="'Capture'"
YOUR_USERNAME="username"
if amixer sget $INPUT_DEVICE,0 | grep '\[on\]' ; then
    amixer sset $INPUT_DEVICE,0 toggle
    #echo "0 blink" > /proc/acpi/ibm/led
    su $YOUR_USERNAME -c 'DISPLAY=":0.0" notify-send -t 50 \
            -i microphone-sensitivity-muted-symbolic "Mic MUTED"'
else
    amixer sset $INPUT_DEVICE,0 toggle                       
    su $YOUR_USERNAME -c 'DISPLAY=":0.0" notify-send -t 50 \
            -i microphone-sensitivity-high-symbolic "Mic ON"'
    echo "0 on" > /proc/acpi/ibm/led 
fi

Important: Replace username with your Linux username.

Find your Linux username by typing "whoami" in the terminal.

Finally, I did this:

sudo chmod +x /etc/acpi/lenovo-mutemic.sh

sudo service acpid restart

Thank you random user on AskUbuntu!