[PATCH 1/4] ALSA: hda/realtek: fix mute/micmute LEDs for HP 855 G8

[Alexander Sergeyev]

Hello,

On Thu, May 20, 2021 at 01:03:53AM +0800, Jeremy Szu wrote:
>The HP EliteBook 855 G8 Notebook PC is using ALC285 codec which needs
>ALC285_FIXUP_HP_MUTE_LED fixup to make it works. After applying the
>fixup, the mute/micmute LEDs work good.

I've recently got HP EliteBook 855 G8 and it happens that neither micmute LED 
nor speakers work (except rare cases, more on that later) in 5.16.0. The 
corresponding ALC285_FIXUP_HP_MUTE_LED fixup is definitely applied (verified by 
adding a printk into alc285_fixup_hp_mute_led).

What is the most interesting, both micmute LED and speakers do work on rare 
boots. I've written some scripts to pick up sound from speakers using a 
known-good USB microphone. Out of 709 boots today only 16 ended up with working 
micmute LED and speakers.

Is there anything I can do to help with debugging of this problem?

Initially reported at https://bugzilla.kernel.org/show_bug.cgi?id=215466