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I have a mic mute button on my Lenovo Thinkpad T420, but it doesn't work.So I tried xev command to monitor press event, and that key wasn't captured.Is there anyway to fix it, like add raw key code?OS & LaptopUbuntu 12.04, also hope it works on Arch Linux, but doesn't matter much;-PThinkpad Module: X220 4290LY9Kernel patch for Arch LinuxFINALLYIt's a little tricky, but with the kernel patch and acpid script, it works now.The rest I need is a notify daemon like the one for output mute, but it doesn't matter much now. This solution should work for all Thinkpads with a mute button which also has a built-in light. It may also work for other Thinkpads.Apart from the notification bubbles:There are two possible 'hardware' indicators (to show that mute is on or off):. The Power button light (green) will blink to show when mute is on.The Mic mute button light (orange) will be on or off to show mute status (just like in Windows)Solution 2 requires a patched thinkpadacpi kernel module, and is only recommended for advanced users who know what they are doing. This is because the patch is not included by the thinkpadacpi developers by default,.Common Stepsa. Determining the Mic-Mute hotkey code and Mic input device. Open terminal with Ctrl+Alt+T.

Run acpilisten, and press the mute key.Note the result, which should be something like:ibm/hotkey HKEY 000101b.Then run amixer scontrols, you should see one of the following in the output:Simple mixer control 'Internal Mic',0orSimple mixer control 'Capture',0Depending on what you see, 'Internal Mic' or 'Capture' is your input device. Create the Mic-Mute ACPI event handler. Open terminal, type gksudo gedit /etc/acpi/events/lenovo-mutemic to open the editor. In the editor, paste in the following, where the first line should be the code shown in the previous section by acpilisten:event=ibm/hotkey HKEY 000101baction=/etc/acpi/lenovo-mutemic.sh. Save and exit the editor.Choosing either the Power Light or Mic Mute indicatorsc-1.