Re: [Jack-Devel] How do I replicate the -P parameter when using dbus

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DateWed, 23 Nov 2011 12:48:56 +0000
From Roger James <[hidden] at beardandsandals dot co dot uk>
To[hidden] at lists dot jackaudio dot org
In-Reply-ToPaul Davis Re: [Jack-Devel] How do I replicate the -P parameter when using dbus
Follow-UpRoger James Re: [Jack-Devel] How do I replicate the -P parameter when using dbus
On 22/11/11 20:36, Paul Davis wrote:
> On Tue, Nov 22, 2011 at 3:30 PM, Roger James
> <[hidden]>  wrote:
>
>> I guess if I want to use qjackctl I will have to go back to figuring why the
>> server hangs when capture ports are specified on my system that has a
>> standard onboard nVidia HDA chipset. But that is for another day.
> this is a common problem. it typically (not always) means that have
> not set the capture source (in the h/w mixer) correctly. the device
> refuses to start in duplex mode when this is the case. ALSA drivers
> get this wrong, probably through lack of information but it could also
> be a straight bug. use alsamixer or something equivalent to select a
> valid capture source.
Some final words on replicating the -P behaviour. The absolute minimum 
config that I could get to work was as follows:

<driver name="alsa">
<option name="capture">0</option>
<option name="duplex">false</option>
</driver>

All the other driver parameters can be left to default their "unset" 
values. Note that setting the capture parameter to its unset default 
value of "none" (i.e. str:set:none:none) does not work, it must show in 
dp as str:set:none:0.

Paul, I suspected that the capture source settings must be the problem 
and I played with alsamixer to try to fix it. I could not find a 
combination of settings that fixed it.

The card is an nVidia onboard HDA chipset

00:07.0 Audio device: nVidia Corporation MCP72XE/MCP72P/MCP78U/MCP78S 
High Definition Audio (rev a1)

I have tried front and rear mic capture sources and the switches on the 
two capture volume controls off and on. No joy.

Roger
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