[alsa-devel] Grey noise with HDA Intel PCH

[Julian Wollrath]

Am Thu, 14 Aug 2014 12:20:11 +0200
schrieb Clemens Ladisch <clemens at ladisch.de>:

> Julian Wollrath wrote:
> > when having my soundcard not muted, I get to hear grey noise over
> > the speakers or over the headphone
> >
> > Simple mixer control 'Master',0
> >   Mono: Playback 19 [22%] [-51.00dB] [on]
> 
> This is rather low.  A lower signal level implies a worse signal-to-
> noise ratio.
It is also hearable, with the volume turned up higher and when nothing
is playing.

> > Simple mixer control 'Mic',0
> >   Front Left: Playback 0 [0%] [-34.50dB] [on]
> >   Front Right: Playback 0 [0%] [-34.50dB] [on]
> 
> This plays any noise from the mic input.
Turning it off makes no difference since capture is turned off anyway:
> > Simple mixer control 'Capture',0
> >  Capabilities: cvolume cswitch
> >  Capture channels: Front Left - Front Right
> >  Limits: Capture 0 - 63
> >  Front Left: Capture 63 [100%] [30.00dB] [off]
> >  Front Right: Capture 63 [100%] [30.00dB] [off]

Cheers,
Julian