High pitched sound when starting jackd

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High pitched sound when starting jackd

Stephen Torri
Problem: High pitch sound coming from computer when starting jackd.
Sound goes away if jackd is stopped. Is there a known problem with the
Intel ICH5/ICHSR chipset?

Method of starting jack: qjackctl as a regular user

System:
       
        Linux base.torri.org 2.6.13-gentoo-r5 #1 SMP Sun Oct 30 00:49:36
        CDT 2005 i686 Intel(R) Pentium(R) 4 CPU 3.00GHz GenuineIntel
        GNU/Linux

Sound card:

        MSI motherboard
        0000:00:1f.5 Multimedia audio controller: Intel Corporation
        82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02)
                Subsystem: Micro-Star International Co., Ltd.: Unknown
        device 0080
                Flags: bus master, medium devsel, latency 0, IRQ 21
                I/O ports at c800 [size=256]
                I/O ports at c400 [size=64]
                Memory at febffe00 (32-bit, non-prefetchable) [size=512]
                Memory at febffd00 (32-bit, non-prefetchable) [size=256]
                Capabilities: <available only to root>

Other:

        Installed realtime-lsm to run jackd in realtime mode. Kernel
        module is automatically loaded on startup.
       
Stephen

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Re: High pitched sound when starting jackd

Sampo Savolainen
Quoting Stephen Torri <[hidden email]>:

> Problem: High pitch sound coming from computer when starting jackd.
> Sound goes away if jackd is stopped. Is there a known problem with the
> Intel ICH5/ICHSR chipset?

I'm pretty interested in the results of this question myself. I've notice
this happening on my ICH4 shuttle box.

My wobbly theory is that there is a component on the motherboard (the
soundcard's clock crystal?) which reacts to the relatively low buffer sizes
that jackd uses and starts to oscillate on a frequency which we can hear. Or
we can hear the resonances caused by the oscillation.

I've noticed this happenin at 2x512 and below. Also, i've notice this in
other cases too, like dragging a PDF around with the mouse in acrobat reader.

Just to avoid people misunderstanding this issue: the high pitch sound does
NOT come from the soundcard outputs, but it's a physical sound coming from
the computer (motherboard) itself.


 Sampo


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nbd
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Re: High pitched sound when starting jackd

nbd
>> Problem: High pitch sound coming from computer when starting jackd.

Now that you mention, I remember having similar noise. I think it's gone
now, but I'm not loading modules for motherboard soundcard anymore. I
should check if the mobo sound chip is responsible..

Tommi


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Re: High pitched sound when starting jackd

Stephen Torri
In reply to this post by Stephen Torri
Is this mailing list the right place to report this problem? I was
wondering if I wrote to the wrong place since I got only one response
saying that they had a similar problem but no one writing for more
information or giving a solution.

Stephen

On Tue, 2005-11-01 at 22:57 -0600, Stephen Torri wrote:

> Problem: High pitch sound coming from computer when starting jackd.
> Sound goes away if jackd is stopped. Is there a known problem with the
> Intel ICH5/ICHSR chipset?
>
> Method of starting jack: qjackctl as a regular user
>
> System:
>        
>         Linux base.torri.org 2.6.13-gentoo-r5 #1 SMP Sun Oct 30 00:49:36
>         CDT 2005 i686 Intel(R) Pentium(R) 4 CPU 3.00GHz GenuineIntel
>         GNU/Linux
>
> Sound card:
>
>         MSI motherboard
>         0000:00:1f.5 Multimedia audio controller: Intel Corporation
>         82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02)
>                 Subsystem: Micro-Star International Co., Ltd.: Unknown
>         device 0080
>                 Flags: bus master, medium devsel, latency 0, IRQ 21
>                 I/O ports at c800 [size=256]
>                 I/O ports at c400 [size=64]
>                 Memory at febffe00 (32-bit, non-prefetchable) [size=512]
>                 Memory at febffd00 (32-bit, non-prefetchable) [size=256]
>                 Capabilities: <available only to root>
>
> Other:
>
>         Installed realtime-lsm to run jackd in realtime mode. Kernel
>         module is automatically loaded on startup.
>        
> Stephen

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Re: Re: High pitched sound when starting jackd

Jack O'Quin-2
Stephen Torri <[hidden email]> writes:

> Is this mailing list the right place to report this problem? I was
> wondering if I wrote to the wrong place since I got only one response
> saying that they had a similar problem but no one writing for more
> information or giving a solution.

Device-specific questions and problems are probably better addressed
to alsa-users.
--
  joq


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