[alsa-devel] clicking noise with Sigmatel STAC9202

Takashi Iwai tiwai at suse.de
Wed Jul 29 15:37:08 CEST 2009

At Wed, 29 Jul 2009 15:06:02 +0200,
Christian Steffen wrote:
> Hello to all subscribers,
> I'm new to this list and will start directly with my problem:
> I'm running some ubuntu linux on a device called "o2 Joggler", which is a
> digital picture frame with touchscreen control.
> Its chipsets are from intel, the cpu is an intel atom, and the other
> hardware devices are controlled by an Intel System Controller Hub "Poulsbo".
> I'm running kernel 2.6.30 and the newest alsa version 1.0.20.
> This is lscpi output:
> >>00:1b.0 Audio Device: Intel Corporation System Controller Hub (SCH
> Poulsbo) HD Audio Controller (rev 07)
> cat proc/asound/cards:
> >>0 [MID     ]: HDA-Intel - HDA Intel MID
> >>              HDA Intel MID at 0xd01c000 irq 16
> The Codec is a
> >>Sigmatel STAC9202
> My problem is, that sound is working, but has constant clicking noise in the
> background, also if the sound is completely muted.
> First I thought this sound would come from some hdd or whatever, but the
> device has no mechanical parts. But this is what it sounds like - Irregular
> clicking noise.
> This noise immediately starts during boot up as soon as the module is loaded
> and before X11 has started.
> I already tried options like "position_fix=1 or 2" and different
> "model="-options with no success.
> "position_fix" didn't do anything at all and different model-options have
> muted the device completely.
> Has someone any idea to get this working?
> The device comes with an own (hardly) closed linux which runs a 2.6.24
> kernel - here sound is working with no problems at all.

Is the older kernel as is even with the same user-space stuff?
If so, run alsa-info.sh (with --no-upload option) and save the
content.  Then run with the newer kernel and save the content.  Attach
both files to compare.



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