[PATCH] ALSA: hda/realtek - Couldn't detect Mic if booting with headset plugged

[Takashi Iwai]

On Mon, 14 Sep 2020 08:51:18 +0200,
Hui Wang wrote:
> 
> We found a Mic detection issue on many Lenovo laptops, those laptops
> belong to differnt models and they have different audio design like
> internal mic connects to the codec or PCH, they all have this problem,
> the problem is if plugging a headset before powerup/reboot the
> machine, after booting up, the headphone could be detected but Mic
> couldn't. If we plug out and plug in the headset, both headphone and
> Mic could be detected then.
> 
> Through debugging we found the codec on those laptops are same, it is
> alc257, and if we don't disable the 3k pulldown in alc256_shutup(),
> the issue will be fixed. So far there is no pop noise or power
> consumption regression on those laptops after this change.
> 
> Cc: Kailang Yang <kailang at realtek.com>
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Hui Wang <hui.wang at canonical.com>

Applied now.  Thanks.


Takashi