ice1712 noise

ice1712 noise

[Anthony]

Hi, I've been hearing for some weeks now a very high
frequency, quiet crackling distortion when using my
delta44 on playback. This is with driver versions
0.9.8 and 1.0.2.

Symptoms:
* It only occurs on playback.
* It is not always present, but once it manifests
  it is consistent.
* I've ruled out external gear by swapping everything
* It cannot be recorded...i.e. if i use jack capture
  while it is happening, and playback on my other
  card I do not hear it
* I have been able to reproduce it with alsaplayer
  using the hardware layer (so not a jack problem).
* shutting down alsa apps and restarting the drivers
  fixes the problem until it reoccurs. It can take
  a long to to resurface.
* Of course, there is no way for me to rule out the
  card itself as being the problem.
* Other than driver changes, my system has been
  a rather stable 2.4.21 kernel.

I wonder if there was significant changes to the driver
that someone might suggest an earlier driver version to
try. TIA.

--ant


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Re: ice1712 noise

[Jaroslav Kysela]

On Sat, 31 Jan 2004, Anthony wrote:

> Hi, I've been hearing for some weeks now a very high
> frequency, quiet crackling distortion when using my
> delta44 on playback. This is with driver versions
> 0.9.8 and 1.0.2.
> 
> Symptoms:
> * It only occurs on playback.
> * It is not always present, but once it manifests
>   it is consistent.
> * I've ruled out external gear by swapping everything
> * It cannot be recorded...i.e. if i use jack capture
>   while it is happening, and playback on my other
>   card I do not hear it
> * I have been able to reproduce it with alsaplayer
>   using the hardware layer (so not a jack problem).
> * shutting down alsa apps and restarting the drivers
>   fixes the problem until it reoccurs. It can take
>   a long to to resurface.
> * Of course, there is no way for me to rule out the
>   card itself as being the problem.
> * Other than driver changes, my system has been
>   a rather stable 2.4.21 kernel.

It looks like that something is wrong with DACs.
Does the noise occur on all outputs?

				 	Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs


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Re: ice1712 noise

[Anthony]

* Jaroslav Kysela <perex@suse.cz> [Jan 31 04 13:16]:
> It looks like that something is wrong with DACs.                            
> Does the noise occur on all outputs?                                         
>                                                                              
>                                       Jaroslav                               

I hope not! I think it occurs on all channels, but have
yet to reproduce it today to verify. I'm thinking about
installing a windows OS and testing there. I've also
noticed immediately after upgrading to 1.0.2 that I get
occasional drop outs on playback...they are not xruns,
at least they dont sound as harsh and jackd doesn't
report them - just an instant of silence.

--ant


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Re: ice1712 noise

[Anthony]

* Anthony <avan@uwm.edu> [Jan 31 04 14:43]:
> * Jaroslav Kysela <perex@suse.cz> [Jan 31 04 13:16]:
> > It looks like that something is wrong with DACs.                            
> > Does the noise occur on all outputs?                                         
> >                                                                              
> >                                       Jaroslav                               

FWIW, the crackling noise was due to my NIC. I hadn't
noticed it before since my bandwidth was recently 
increased by my ISP. I guess its a good thing in some 
way.

I'm still getting some bizarre behaviour when running
an ardour session recorded at 44.1Khz. Occasionally
I get a pop and envy24control shows the output levels
constantly maxed out. This doesn't make sense to me
since jack should of already opened the device and is
writing silence. I vaugely remember this being a problem
when I first got the card that eventually disappeared.
That, or I haven't been doing much of anything at 44.1
to notice.

--ant


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