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

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Message-ID: <s5hskd1yy30.wl%tiwai@suse.de>
Date:	Fri, 30 Oct 2009 11:29:07 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Lubomir Rintel <lkundrak@...sk>
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

At Sun, 18 Oct 2009 18:37:28 +0200,
Lubomir Rintel wrote:
> 
> On Mon, 2009-10-12 at 10:08 +0200, Takashi Iwai wrote:
> > 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?
> 
> I did not try that, but updated to a newer snapshot and it works as it
> used to again, so I don't thing there's much point in finding out what
> went wrong now. I'm very sorry for the noise.

OK, thanks for confirmation.


Takashi
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