[alsa-devel] Intel HD: ALC662 noise-bug on FitPC2i

Bent Bisballe Nyeng deva at aasimon.org
Wed Dec 12 15:45:46 CET 2012

On 12/12/12 15:25, Takashi Iwai wrote:
> At Wed, 12 Dec 2012 14:14:57 +0100,
> Bent Bisballe Nyeng wrote:
>> On 12/12/12 14:05, Clemens Ladisch wrote:
>>> Bent Bisballe Nyeng wrote:
>>>> When recording, audible clicking sounds are present in the resulting
>>>> audio data.
>>>> The corruption are composed of approximately 10 samples, and the
>>>> nature of the corrupted values are such that they could come from an
>>>> earlier buffer (the corrupted data resemble wav forms).
>>> This looks like a problem with your HDA controller; either the memory
>>> bus is overloaded so that some writes are dropped, or the hardware is
>>> just buggy.
>>> Regards,
>>> Clemens
>> I tried to record some audio using windows 7 and here the noise was not
>> present indicating that it is not buggy hardware.
>> Also, the system was not under load when the arecord call was made so if
>> the memory bus was overloaded I need another way to verify this.
>> Are there any additional (useful) debugging info I can subtract from the
>> system that will help aiding the debugging process?
> Which sound backend are you using at all?  Does the problem appear if
> you run with -Dhw for arecord?
> If it's using dsnoop or PulseAudio, the accuracy of DMA position
> reporting plays a big role.  In that case, changing position_fix
> option cures often.
> Takashi

There are no sound servers installed on the pc in question (it is a
'lean' pc) so arecord should be using the hardware directly already.

I will try to run arecord with the -D parameter tomorrow.

Kind regards
Bent Bisballe Nyeng

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