Re: [PATCH] ALSA: hda/realtek: Fix microphone regression on ASUS N705UD

[Takashi Iwai <tiwai@suse.de>]

On Wed, 26 Feb 2025 14:55:15 +0100,
Adrien Vergé wrote:
> 
> This fixes a regression introduced a few weeks ago in stable kernels
> 6.12.14 and 6.13.3. The internal microphone on ASUS Vivobook N705UD /
> X705UD laptops is broken: the microphone appears in userspace (e.g.
> Gnome settings) but no sound is detected.
> I bisected it to commit 3b4309546b48 ("ALSA: hda: Fix headset detection
> failure due to unstable sort").
> 
> I figured out the cause:
> 1. The initial pins enabled for the ALC256 driver are:
>        cfg->inputs == {
>          { pin=0x19, type=AUTO_PIN_MIC,
>            is_headset_mic=1, is_headphone_mic=0, has_boost_on_pin=1 },
>          { pin=0x1a, type=AUTO_PIN_MIC,
>            is_headset_mic=0, is_headphone_mic=0, has_boost_on_pin=1 } }
> 2. Since 2017 and commits c1732ede5e8 ("ALSA: hda/realtek - Fix headset
>    and mic on several ASUS laptops with ALC256") and 28e8af8a163 ("ALSA:
>    hda/realtek: Fix mic and headset jack sense on ASUS X705UD"), the
>    quirk ALC256_FIXUP_ASUS_MIC is also applied to ASUS X705UD / N705UD
>    laptops.
>    This added another internal microphone on pin 0x13:
>        cfg->inputs == {
>          { pin=0x13, type=AUTO_PIN_MIC,
>            is_headset_mic=0, is_headphone_mic=0, has_boost_on_pin=1 },
>          { pin=0x19, type=AUTO_PIN_MIC,
>            is_headset_mic=1, is_headphone_mic=0, has_boost_on_pin=1 },
>          { pin=0x1a, type=AUTO_PIN_MIC,
>            is_headset_mic=0, is_headphone_mic=0, has_boost_on_pin=1 } }
>    I don't know what this pin 0x13 corresponds to. To the best of my
>    knowledge, these laptops have only one internal microphone.
> 3. Before 2025 and commit 3b4309546b48 ("ALSA: hda: Fix headset
>    detection failure due to unstable sort"), the sort function would let
>    the microphone of pin 0x1a (the working one) *before* the microphone
>    of pin 0x13 (the phantom one).
> 4. After this commit 3b4309546b48, the fixed sort function puts the
>    working microphone (pin 0x1a) *after* the phantom one (pin 0x13). As
>    a result, no sound is detected anymore.
> 
> It looks like the quirk ALC256_FIXUP_ASUS_MIC is not needed anymore for
> ASUS Vivobook X705UD / N705UD laptops. Without it, everything works
> fine:
> - the internal microphone is detected and records actual sound,
> - plugging in a jack headset is detected and can record actual sound
>   with it,
> - unplugging the jack headset makes the system go back to internal
>   microphone and can record actual sound.
> 
> Cc: stable@vger.kernel.org
> Cc: Kuan-Wei Chiu <visitorckw@gmail.com>
> Cc: Chris Chiu <chris.chiu@canonical.com>
> Fixes: 3b4309546b48 ("ALSA: hda: Fix headset detection failure due to unstable sort")
> Tested-by: Adrien Vergé <adrienverge@gmail.com>
> Signed-off-by: Adrien Vergé <adrienverge@gmail.com>

Thanks, applied now.


Takashi