Re: [LAU] jackd core dumps in duplex mode

From: Gerhard Zintel <gerhard.zintel@email-addr-hidden>
Date: Mon Aug 03 2015 - 20:03:32 EEST

On Monday 03 August 2015, you wrote:
> On Sun, Aug 2, 2015 at 4:26 PM, Gerhard Zintel
<gerhard.zintel@email-addr-hidden> wrote:
> > jackd watchdog: timeout - killing jackd
> > Aborted (core dumped)
>
> You're device is likely configured incorrectly, so that JACK never
> actually gets woken up by the device, times out and deliberately
> kills itself.
>
> You need to use alsamixer or an equivalent to select the correct
> capture source on the device. This was a relatively common issue
> with Intel HDA chipsets a few years ago - I haven't been hearing
> about it as much recently.

Thanks a lot Paul for the pointer
Short story: jackd is running again in duplex mode. Case solved.

Nonetheless:
If no capture source is selected in alsamixer, why does capture only
mode work in jackd without problems and times out as soon as duplex
mode is selected? Strange.

Furthermore:
I tried to tune the settings in alsamixer before bothering the list.
For weeks I tried all permutations in alsamixer and qjackctl without
success. Today, after your response, I opened alsamixer again, two
devices (Capture and Capture1) have been in Capture mode. I switched
off both, switched only Capture into capture mode and jackd started
in duplexmode without problems. Out of curiosity I tried to recreate
the old behavior - no chance, it's not longer possible. Even if I
switch on / off capture mode for both Capture devices and chose
different hardware interfaces in qjackctl (hw:0 = HDA Intel PCA,
hw:0.0 = VT2020 analog) jackd starts trouble-free for all
combinations. I do not really know the culprit. Alsa and jackd are
still black boxes to me.

Again, thanks a lot
Gerhard
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Received on Mon Aug 3 20:15:01 2015

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