Microphone mute button doesn't work in Ubuntu GNOME 13.10 and 14.04

[Marius Gedminas]

On Wed, Mar 12, 2014 at 11:54:57AM -0500, Christian Dysthe wrote:
> I am not sure whether this is a Ubuntu GNOME or general Ubuntu problem
> but the microphone mute button on my Thinkpad T430S button does not work
> in Ubuntu GNOME 13.10 and 14.04.

I've a ThinkPad X220.  The mic mute button works fine in Ubuntu GNOME 13.10.

> I know it has worked with Ubuntu in the past, but not now. It does
> work in other Gnome-Shell distros I have used recently like Arch based
> Manjaro GNOME and Fedora 20. I checked with those two again now and it
> works in both of them. I find it hard to report this as a bug since I
> have no idea what makes this button work in the first place.

The thinkpad_acpi kernel module, via the
/dev/input/by-path/platform-thinkpad_acpi-event input device.

Verified by doing

  sudo cat /dev/input/by-path/platform-thinkpad_acpi-event

and watching binary garbage as I press that button.

(sudo showkeys shows press and release events from keycode 190)

xev doesn't show these key events because they're grabbed by something
(gnome-settings-manager most likely).  I get OSD popups when I press
this button.

Hopefully this has given you some information about how to begin
bisecting where the problem is (kernel/Xorg/GNOME configuration).

> Right now there's not any output from 'acpi_listen' either on Ubuntu
> GNOME 14.04. All the other buttons work.

Hmm, acpi_listen gives me

  ibm/hotkey HKEY 00000080 0000101b

Interesting.

Marius Gedminas
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