Comment 1 for bug 1531362

The patches for Linux kernel driver have been merged to upstream.

commit c7b60a89516beb20a352ec85c73a8fccd5becf26
Author: Hui Wang <email address hidden>
Date: Mon Dec 28 11:35:25 2015 +0800

    ALSA: hda - Add keycode map for alc input device

    Then users can remap the keycode from userspace. If without the remap,
    the input device will pass KEY_MICMUTE to userspace, but in X11 layer,
    it uses KEY_F20 rather than KEY_MICMUTE for XF86AudioMicMute. After
    adding the keycode map, users can remap the keycode to any value users
    want.

    Cc: <email address hidden>
    Signed-off-by: Hui Wang <email address hidden>
    Signed-off-by: Takashi Iwai <email address hidden>

commit 3694cb2947db50753caf432db067487eafae7b9b
Author: Kailang <email address hidden>
Date: Mon Dec 28 11:35:24 2015 +0800

    ALSA: hda - Add mic mute hotkey quirk for Lenovo ThinkCentre AIO

    The Lenovo ThinkCenter AIO uses Line2 (NID 0x1b) to implement the
    micmute hotkey, here we register an input device and use Line2 unsol
    event to collect the hotkey pressing or releasing.

    In the meanwhile, the micmute led is controlled by GPIO2, so we
    use an existing function alc_fixup_gpio_mic_mute_hook() to control
    the led.

    [Hui: And there are two places to register the input device, to make
    the code simple and clean, move the two same code sections into a
    function.]

    Cc: <email address hidden>
    Signed-off-by: Kailang <email address hidden>
    Signed-off-by: Hui Wang <email address hidden>
    Signed-off-by: Takashi Iwai <email address hidden>