From: Clemens Ladisch <clemens@ladisch.de>
To: Javier Kohen <jkohen@users.sourceforge.net>
Cc: alsa-devel@alsa-project.org
Subject: Re: Quirk to disable master volume control in PCM2702
Date: Tue, 17 Nov 2009 10:04:30 +0100 [thread overview]
Message-ID: <4B02671E.8070306@ladisch.de> (raw)
In-Reply-To: <861213340911161517tfb33467i9a4b270c0a548c69@mail.gmail.com>
Javier Kohen wrote:
> I've written the attached patch to disable the master volume control
> in this chipset. The datasheet [1] documents two independent channel
> volume controls, one master mute control and one master volume
> control. However, at least on my device (a Fubar USB DAC), the master
> volume control always returns USB stalls when queried for any of its
> parameters (min/max/res/cur).
I'd guess that Windows ignores the master volume when it finds
channel volume controls, so this function was never actually tested.
> However, it seems that either the USB specs are wrong,
They are abominations written by committees.
> or my USB hub or the card are buggy.
Your hub is certainly buggy ...
> the PCM2702 and my motherboard don't interact well. After a while the
> sound is degraded, first into a hiss, then into pure noise.
... the card too.
Your patch looks good; please provide a log message and a Signed-off-by
tag.
Best regards,
Clemens
next prev parent reply other threads:[~2009-11-17 9:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <861213340911161513n53c8b303i67ac2f07db87cddc@mail.gmail.com>
2009-11-16 23:17 ` Quirk to disable master volume control in PCM2702 Javier Kohen
2009-11-17 9:04 ` Clemens Ladisch [this message]
2009-11-17 10:59 ` Javier Kohen
2009-11-17 11:03 ` Takashi Iwai
2009-11-17 14:36 ` Javier Kohen
2009-11-17 14:50 ` Takashi Iwai
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