[LAD] JACK on Gigaport HD+ at 4800kHz (reduced channel count)

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To: The Linux Audio Developers' Mailing List <linux-audio-dev@...>
Date: Monday, February 24, 2014 - 10:35 pm

Hi *!

I'm trying to get my Gigaport HD+ to run at 48000kHz. The specs say it
is capable of 8ch @ 44k1/16, 6ch at 44k1/24 and 48k/24.

When I try to start it at 48k, it comes up ok but ends up running at
44k1. It shows 8 channels, so that's expected.
Now, how do I tell it to use only 6, so that I can get to 48k?
I've tried setting -o6, which gives the usual "cannot set playback
channel count".
Next I looked at amixer -D hw:3 controls, and there is a playback switch
map that is set to "on,on,on,on,on,on,on,on". I set it to
"on,on,on,on,on,on,off,off" and retry. No luck. Still fails to set
playback channel count, JACK still comes up with 8 outs and falls back
to 44k1.

What am I missing? Is there some .asoundrc magic that might come to the
rescue? Maybe define a device that has only 6 channels to begin with?
But how do I do that?

Any hints much appreciated.

Best,

Jörn

--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487

Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT

http://stackingdwarves.net

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Messages in current thread:
[LAD] JACK on Gigaport HD+ at 4800kHz (reduced channel count), Jörn Nettingsmeier, (Mon Feb 24, 10:35 pm)
Re: [LAD] JACK on Gigaport HD+ at 4800kHz (reduced channel c..., Jörn Nettingsmeier, (Tue Feb 25, 10:08 pm)
Re: [LAD] JACK on Gigaport HD+ at 4800kHz (reduced channel c..., Jörn Nettingsmeier, (Tue Feb 25, 1:25 pm)