[alsa-devel] Noise on snd-hda-intel

Raymond Yau superquad.vortex2 at gmail.com
Fri Jul 1 13:53:08 CEST 2011

2011/6/24 Sune Mølgaard <sune at molgaard.org>:
> Raymond Yau wrote:
>> Does the noise appear when you increase  "Front Mic Boost" control
>> from 0dB to 30 dB ?
>> arecord -v -f CD -Dhw:CARD=Intel | aplay -v -Dhw:CARD=Intel
> Those commands give
> aplay: main:660: audio open error: Device or resource busy
> and thus no sound. I have played around with Front Mic Boost, though -
> it doesn't seem to alter the level of noise.

Which asus motherboard are you using ?

Do your computer chassis have a HD compliant front audio panel ?

I cannot find any situation which "Noise" appear in Front Panel HP
only  and does not on rear panel jacks for my ad1988a

I guess you have to check the front panel connector and Front Audio Panel

There are "click" when I change "Beep Playback Volume" and "pop" when
unmute "Beep Playback Switch" in alsamixer on both HP jack and rear
panel jacks of my ad1988

aplay -D pulse --period-time=500 48000Hz.wav

Playing one instance of aplay at minimum period time just cause CPU go
up to 20% and the sound is still good

However sound is distorted after you play another instance of aplay at
the same time

aplay -D pulse --period-time=500 44100Hz.wav

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