[alsa-devel] [PATCH 1/1] ALSA: ALC283 codec - Avoid pop noise on headphones during suspend/resume

[Hui Wang]

On 10/13/2014 06:50 PM, David Henningsson wrote:
>
> On 2014-10-09 20:41, Takashi Iwai wrote:
>> At Thu,  9 Oct 2014 11:04:56 +0000,
>> Harsha Priya wrote:
>>> This patch sets the headphones mode to default before suspending
>>> which helps avoid the pop noise on headphones
>> The change looks simple, but since it's a mysterious COEF, I'd like to
>> hear from people testing with other machines with this codec before
>> applying the patch.
>>
>> David, do you know anyone in your team have such a machine to test?
>
> Looping Hui here, do you have a machine with ALC283 to test with or 
> knows who has one?
One of my colleague performed the test, and seems the patch did work.  
Below is the feedback from my colleague:

"I tested the patch on Dell Inspiron 3531 which has ALC283 Codec on it.
  Without the patch, I can hear a pop noise from the headphone, not very harshly, but I can
  hear there is a pop sound clearly when suspend or reboot.
  With the patch, there is still a pop sound with very low volume when
  suspend, you can notice the sound when listening it carefully.
  When reboot, there is no pop sound."


Regards,
Hui.

>
>>
>>
>> thanks,
>>
>> Takashi
>>
>>> Signed-off-by: Harsha Priya <harshapriya.n at intel.com>
>>>
>>> diff --git a/sound/pci/hda/patch_realtek.c 
>>> b/sound/pci/hda/patch_realtek.c
>>> index 69d1236..e839e7a 100644
>>> --- a/sound/pci/hda/patch_realtek.c
>>> +++ b/sound/pci/hda/patch_realtek.c
>>> @@ -2884,6 +2884,9 @@ static void alc283_shutup(struct hda_codec 
>>> *codec)
>>>         alc_write_coef_idx(codec, 0x43, 0x9004);
>>>   +    /*depop hp during suspend*/
>>> +    alc_write_coef_idx(codec, 0x06, 0x2100);
>>> +
>>>       snd_hda_codec_write(codec, hp_pin, 0,
>>>                   AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_MUTE);
>>>   --
>>> 1.9.1
>>>
>
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