[alsa-devel] [PATCH 0/2] Make ASUS Xonar U3 S/PDIF channel accessible

Denis Washington denisw at online.de
Tue Dec 11 19:24:55 CET 2012

Am 11.12.2012 12:41, schrieb Takashi Iwai:
> At Tue, 11 Dec 2012 11:37:26 +0100,
> Denis Washington wrote:
>> Hello,
>> This is my first ALSA patch ever (in fact, also my first kernel patch
>> and my first e-mail to this mailing list); as such, I'm sorry when I did
>> something wrong and/or didn't follow the procedure properly. I hope you
>> can forgive me.
>> I recently bought an ASUS Xonar U3 USB audio card. It general it works
>> well with Linux, but unfortunately, it's PCM output channel is unusable
>> for headphones because it allows virtually no volume control (maximum
>> loudness is already reach at a volume level of 2 or 3). The card does
>> also have a digital (S/PDIF) output channel, which however isn't
>> switched on by the Linux USB audio driver:
>> http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg28970.html
>> When I boot into Windows (where the ASUS driver seemingly enables the
>> channel) and then reboot into Linux, I can use this channel and control
>> volume as expected. It's just this turning on of S/PDIF which is
>> missing, as suggested by the alsa-user thread linked to above.
>> The patchset that follows enables S/PDIF on the Xonar U3 by using the
>> (seemingly compatible) mixer quirks code as for the U1, just as done and
>> tested by the initiator of the alsa-user thread, together with a very
>> minor cleanup (renaming internal xonar_u1_* identifiers to just
>> xonar_u_*). The change seems to work well (tested with the 3.7.0 Ubuntu
>> kernel as found in today' daily version).
> Thanks for patches.
> I think the rename of xonar_u1_* isn't needed.  What we need is rather
> giving more comments there, that it's for both U1 and U3.

Yes, that would be useful. I don't know if I'm qualified to write a 
useful comment for this, though.

> In anyway, could you resubmit with your sign-off?
> Put a line like
> 	Signed-of-by: Your Name <foo at bar.com>
> in the tail of the change log text.

OK, no problem.


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