Re: audio problem ...

Hi all,

... I need a little help/advice, as programming & especially the linux kernel
is new ground to me. Well - I´ve managed to configure the kernel
K2-4-19-rmk6-pxa1-hh37 & to x-compile it for my iPAQ 3870. With make xconfig
I´ve enabled all the kernel hacking options (except spinlock & waitqueue) in
the hope the sound modules will become verbouse ...

The size of the so compiled modules increase significantly (h3600-uda1341 from
7576 to 154352 Bytes) and sound works with those new modules.
But dmesg nor /var/log/messages (if I start syslogd) provide any information
what is happening in those modules.

My questions therefore are:
- is there something else I´ve to do to activate the debug
- where can I grap those messages

any advice and/or literary/www references are very welcome.

with kind regards,
Patrik

On Thursday 08 September 2005 18.04, Patrik Gfeller wrote:
> Hi Paul (et all),
>
> it seems that iPAQ-3870 is equipped with a philips uda1341 sound chip.
> Therefore sa1100-audio, uda1341 & h3600-uda1341 modules are involved ... I
> was able to compile/build them myself (with the click/pop problem).
>
> Now I´ll try to understand this printk thing - & how to build them with the
> debug stuff enable ... maybe this will throw some more light on the issue.
>
> with kind regards,
> Patrik
>
> On Tuesday 30 August 2005 03.39, Paul Eggleton wrote:
> > Hi Patrik,
> >
> > > The main symptoms are clicks when opening & closing /dev/dsp. As I
> > > listen to e-books with opie-reader & flite I've those clicks after
> > > every sentence (there's a work around - but it's still anoying).
> >
> > Yes I agree this is very annoying. There are other problems too - on the
> > h3800 the audio device does not always work after resume, either. But
> > that's a separate issue.
> >
> > > Well - I decided to try to fix this, but I've to confess that I'll need
> > > some help/tips.
> > > As the bug was not present in 0.7.2 I thought with diff'ing some driver
> > > source files I should find the track - but I was wrong.
> > > Bugzilla #722 has the same symptoms - but I don't know if 39xx uses the
> > > same driver as the 38xx family.
> >
> > It doesn't, they have different sound chips. I can't recall how it works
> > on h3800, but the h3900 uses a uda1380.
> >
> > > What is "soft-start" - & where can it be configured (Google was not
> > > able to answer ...)?
> >
> > Soft-start I believe means ramping the volume up and down rather than
> > just turning the output on/off. I imagine you'd have to do it quite
> > quickly so that it's not noticable. At this stage I don't believe the
> > driver supports this so you would have to modify it. I can't imagine why
> > this is more of a problem now than it was before, though.
> >
> > Cheers,
> > Paul
>
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Received on Thu Sep 08 2005 - 14:26:48 EDT