Ubuntu is able to detect my Lenovo "Mic Mute" button with
acpi_listen, but when I try it on Arch Linux, there is no output available.
Thinkpad X220 4290LY9
Tried to add
acpi_osi=Linux in kernel cmdline, but mic mute still has no output from
acpi_osi option, the led of my output mute button, no longer toggles, but it still functions.