[Bug 2002373] [NEW] Mic Mute LED doesn't work on DMIC laptops

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Kai-Heng Feng (kaihengfeng):

[Impact]
Mic mute LED doesn't work on Intel-based HP laptops.

[Fix]
Due to recent change on how kernel creates sound LEDs, there are two captures are registered, one from SoF and one from HDA. The SoF one is the "real" capture system uses.

Since physical LED only gets light up when _all_ captures are muted,
detach the HDA one so micmute LED only need to consider SoF capture's
mute status.

[Test]
The mic mute LED works again on DMIC laptops.

The legacy HDA systems are unaffected.

[Where problems could occur]
Theoretically the system may have more than two internal captures registered, then disabling one will not be enough.

** Affects: alsa-ucm-conf (Ubuntu)
     Importance: Medium
         Status: Confirmed

** Affects: alsa-ucm-conf (Ubuntu Jammy)
     Importance: Medium
         Status: Confirmed

** Affects: alsa-ucm-conf (Ubuntu Kinetic)
     Importance: Medium
         Status: Confirmed

** Affects: alsa-ucm-conf (Ubuntu Lunar)
     Importance: Medium
         Status: Confirmed

-- 
Mic Mute LED doesn't work on DMIC laptops
https://bugs.launchpad.net/bugs/2002373
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