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@xxxxxxxxxxxxxxx
> Cc: Kuan-Wei Chiu <visitorckw@xxxxxxxxx>
> Cc: Chris Chiu <chris.chiu@xxxxxxxxxxxxx>
> Fixes: 3b4309546b48 ("ALSA: hda: Fix headset detection failure due to unstable sort")
> Tested-by: Adrien Vergé <adrienverge@xxxxxxxxx>
> Signed-off-by: Adrien Vergé <adrienverge@xxxxxxxxx>
Thanks, applied now.
Takashi
