Date: Mon, 12 Oct 2009 10:08:56 +0200
Message-ID: <s5hocoddofb.wl%tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Lubomir Rintel <lkundrak@v3.sk>
Cc: Clemens Ladisch <clemens@ladisch.de>, alsa-devel@alsa-project.org,
       linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [snd-usb-audio] Add match for JMTek USB sound	card
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At Mon, 12 Oct 2009 10:03:53 +0200,
Lubomir Rintel wrote:
> 
> 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?

Hm, I don't see any affecting changes between 2.6.30 and 31.
Just as a test, could you copy sound/usb/*.[ch] from 2.6.30 tree to
2.6.31 or 32-rc and check whether the same problem appears?


Takashi
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