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

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Date:   Wed, 19 Jan 2022 10:12:43 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Alexander Sergeyev <sergeev917@...il.com>
Cc:     Jeremy Szu <jeremy.szu@...onical.com>, tiwai@...e.com,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        Kailang Yang <kailang@...ltek.com>,
        open list <linux-kernel@...r.kernel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jian-Hong Pan <jhp@...lessos.org>,
        Hui Wang <hui.wang@...onical.com>,
        PeiSen Hou <pshou@...ltek.com>
Subject: Re: [PATCH 1/4] ALSA: hda/realtek: fix mute/micmute LEDs for HP 855 G8

On Sat, 15 Jan 2022 16:22:15 +0100,
Alexander Sergeyev wrote:
> 
> On Sat, Jan 15, 2022 at 08:55:28AM +0100, Takashi Iwai wrote:
> > > This patch solved the BUG problem. But after unbind/bind micmute LED
> > > stopped working. Speakers and mute LED are fine though.
> > Does the corresponding sysfs entry exist in /sys/class/leds/*?
> 
> Yes.
> 
> > And can you control LED over there?
> 
> After "out of range cmd" messages the sysfs entry remains present, but writing 
> ones to the brightness file stops to produce any effect.
> 
> Actually, the timing issues are present here as well. Sometimes unbind & bind 
> works fine. But fails on the second round.

Here "fails" means the kernel Oops / crash?  If yes, the back trace
would be helpful.


thanks,

Takashi