Re: Some problems with two 1010LTs (pcm_multi & jackd)

[John Rigg <ad@sound-man.co.uk>]

On Fri, Jan 27, 2006 at 12:53:17PM +0000, John Rigg wrote:
> On Fri, Jan 27, 2006 at 12:14:41AM +0100, Petter Sundlöf wrote:
> > 
> > >>After this I tried to run jackd -d alsa -r44100 -p512 -C multi_capture 
> > >>-P multi_playback
> 
> > >>I then start Ardour and open a session. I place the playhead somewhere 
> > >>and try to start playback. Nothing happens. After a few seconds, Ardour 
> > >>is disconnected from JACK, and I receive this in jackd's stdout:
> > >>
> > >>ALSA: poll time out, polled for 17416024 usecs
> 
> Just thought of something else. envy24control has `Locked' and `Reset'
> buttons. `Locked' keeps the master card's clock set to whatever rate
> is set by envy24control's radio buttons, regardless of what you specify
> on the command line.
> If you have `Locked' set and specify a different rate on the command
> line, jackd just hangs and will probably give a poll timeout 
> (or if you're running it in realtime the jackd watchdog times out).
> 
> Make sure you have the `Locked' button unchecked and the `Reset' button
> checked. `Reset' allows the command line to override the envy24control
> setting for sample rate. I suspect these buttons should be mutually exclusive,
> ie. radio buttons, but they're not (looks like a bug).

This is getting complicated. I start getting all kinds of spurious
behaviour from jackd after I've been setting and resetting things
in envy24control. A reboot is required to make it behave normally again.

On my system the default on startup in envy24control is `Locked' button
unselected, `Reset' selected. All I have to do is tell the second card
to sync to the first with either S/PDIF or wordclock input. Then it
runs fine. The minute I try messing with `Locked' and `Unlocked' buttons
or sample rates jackd starts crashing with a floating point exception
(which I suspect is an indication of the cards losing sync).

It is possible to set this stuff up manually in /etc/asound.state using
the alsactl command to save/restore the settings in this file.
I think I'll start using it to set up my cards' clocks and only use
envy24control for the level meters and routing (at least until I get
hold of an oscilloscope and an external word clock generator to help
diagnose what's going wrong).

(My previous assessment of what the `Locked' and `Reset' buttons are
supposed to do may be incomplete, since they seem to behave differently
at different times).

John


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