linux-kernel - Re: [PATCH] [snd-usb-audio] Add match for JMTek USB sound card

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Date:	Mon, 12 Oct 2009 10:03:53 +0200
From:	Lubomir Rintel <lkundrak@...sk>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Clemens Ladisch <clemens@...isch.de>, alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [snd-usb-audio] Add match for JMTek USB sound	card

On Mon, 2009-10-12 at 09:18 +0200, Takashi Iwai wrote:
> At Mon, 12 Oct 2009 08:46:26 +0200,
> Clemens Ladisch wrote:
> > 
> > Lubomir Rintel wrote:
> > > Entry for JMTek LLC., SSS USB Headphone Set in the quirk table.
> > 
> > Please add an explaination why this entry is needed.  At first glance,
> > this entry seems to describe a class-compliant device that should not
> > need a quirk.
> 
> Ah right.  It'd really helpful if Lubomir can give more details...

A 2.6.31.1-based kernel on my Fedora 12 workstation at hone seemed to
require that, only the input driver attached to the device when plugged
in, the snd-usb-audio didn't seem to load and did not care about the
device when loaded manually. I did not have an idea why, since "alias:
usb:v*p*d*dc*dsc*dp*ic01isc01ip*" really seemed to match my device.
Nevertheless, after finding out that adding an entry to the quirk table
solves my problem I concluded that my understanding (or lack of thereof)
was wrong and that alias is really not meant to match my device.

Now I plugged the adapter into my work lappy with 2.6.30.8-based Fedora
11 and the audio interfaces on my adapter got instantly recognized and
claimed by snd-usb-audio (and the input interface by the input
subsystem), without modifying anything.

Any clues what could have gone wrong then?

-- 
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