[alsa-devel] Constant noise on HDA ALC275

[Julien Danjou]

On Fri, Sep 21 2012, Takashi Iwai wrote:

Hi,

>> I've an HDA based chipset in a new Sony Vaio Z (Ivy Bridge). As sound as
>> the system starts and the sound module are loaded, there's a constant
>> noise (shhhhhhht) in the speakers. The noise change a bit if I toggle
>> the mute button, but it's still there.
>> 
>> This noise stops as sound as I plug something in the jack port.
>
> Do you mean the headphone, or any jacks no matter input or output?

Anything, external speaker, headphones with or without mic. When I plug
something, the noise from the speaker just stops.

I just discoveredtThere's an exception: if a jack is plugged, and if I
set "Auto-Mute mode" to "disabled" in alsamixer the noise can be heared.
If I set "Auto-Mute mode" back to "enabled", no more noise.

> Also do you get the noise from the headphone output?

Never. It's really only the integrated speakers emitting something.

> In anyway, please give alsa-info.sh output (run with --no-upload
> option).  This will cover more wide range of information.

Attached.

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> Last but not least, try the latest kernel (3.6-rc6) if not tried yet :)

I think I forgot to say, I'm running Linux 3.5 indeed. I've tried
3.6-rc1 a couple of weeks ago, and it didn't help. But I'd try rc6 if it
has changes that can be related. :)

Thanks for your help!

-- 
Julien Danjou
-- Free Software hacker & freelance
-- http://julien.danjou.info
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