[alsa-devel] Dell AIO speaker pop noise

[hwang4]

On 2019/4/16 下午4:59, Kailang wrote:
>
>> -----Original Message-----
>> From: Takashi Iwai <tiwai at suse.de>
>> Sent: Tuesday, April 16, 2019 4:22 PM
>> To: Jaroslav Kysela <perex at perex.cz>
>> Cc: Kailang <kailang at realtek.com>; hwang4 <hui.wang at canonical.com>;
>> (alsa-devel at alsa-project.org) <alsa-devel at alsa-project.org>
>> Subject: Re: [alsa-devel] Dell AIO speaker pop noise
>>
>> On Tue, 16 Apr 2019 10:01:31 +0200,
>> Jaroslav Kysela wrote:
>>> Dne 16. 04. 19 v 9:30 Kailang napsal(a):
>>>> Hi Takashi,
>>>>
>>>> Issue 1: The noise keeps occurring via speaker when Headset is plugged in.
>>>> Issue 2: The humming noise is occuring when switching to sound of
>> settings.
>>>> 	 The noise will be stopped when switching to other options of settings.
>>>> Issue 3: The popping noise occurred for one second when plugged in and
>> removed the headset.
>>>> This patch will solve this three issues.
>>> Hi,
>>>
>>>    could you explain, why the power-save function causes this
>>> behaviour? Can we do something else than turning off the power-save
>>> codec settings to avoid such noises? I have this question because it's really
>> easy to disable something, but I feel that the culprit of the noises might be just
>> the wrong codec settings. I guess that you have probably full documentation
>> for the codec and probably for the hardware, so it might be nice to find the
>> real culprit.
>>
>> Note that power_save_node=0 doesn't mean that the whole power saving is
>> disabled.  It disables the fine-grained power saving, i.e. powering down the
>> unused widget nodes.
>>
>> If so, I wonder whether this might be about the default pin-shutup behavior.  I
>> improved the click noise problem on my Dell desktop by disabling the pin
>> shutup.  See commit c0ca5eced222.
>> Kailang, Hui, did you try to add the chain to ALC269_FIXUP_NO_SHUTUP?
>>
> This noise was not happen on poweroff.
> AIO use external AMP. So, it will be need to have a reference voltage via codec.
> So, Pin-ctls was not be 0. I apply option spec->gen.suppress_auto_mute = 1 to avoid that.
> Internal SPK PIN also don't enter to D3. But I find it just only happen on ALC274 family codecs.
> ALC274 pin enter to D3. Pin-ctls also be 0. So, power_save_node=0 will let PIN to D0.
>
> power_save = 0 it also could solve issue.


Yes, avoid setting pinctl is only part fix, the ODM said the main 
problem is the EAPD pin is high->low->high->low periodically, it has sth 
to do with the widget node power state.

>
>
>
>> thanks,
>>
>> Takashi
>>
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