Re: [alsa-devel] [PATCH 1/2] ALSA: hda - Add mic mute hotkey quirk for Lenovo ThinkCentre AIO

[Hui Wang <hui.wang@canonical.com>]

On 12/24/2015 09:03 PM, Takashi Iwai wrote:
> On Thu, 24 Dec 2015 10:39:48 +0100,
> Hui Wang wrote:
>> On 12/24/2015 03:45 PM, Takashi Iwai wrote:
>>> On Thu, 24 Dec 2015 07:44:22 +0100,
>>> Takashi Iwai wrote:
>>>> On Thu, 24 Dec 2015 04:46:37 +0100,
>>>> Hui Wang wrote:
>>>>> From: Kailang <kailang@realtek.com>
>>>>>
>>>>> 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.
>>>>>
>>>>> Cc: <stable@vger.kernel.org>
>>>>> Signed-off-by: Kailang <kailang@realtek.com>
>>>> Is it mandatory expose this as a key event?  I mean, wouldn't it
>>>> suffice just toggle the mic mute by the driver itself?  User-space
>>>> will get the notification by the mixer status change in anyway.
>> We implement it to be an input device just because we need to meet the
>> X11 requirement, the X11 layer capture the key event instead of mixer
>> status. After the X11 get the keycode, It will set microphone to mute
>> from userspace, it is easy to do that by the driver itself, but X11 also
>> need to know the status change, since the X11 will show up an micmute
>> OSD according to status change, and needs to save the finial status
>> before reboot or poweroff. If we don't implement the input device, we
>> have to modify the X11 layer.
> Does the mute button this machine work in that way, too?
There is no mute button on this AIO machine, there is only a micmute 
button on the right side of the monitor.


>
>
> Takashi
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