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From: Clemens Ladisch <clemens@ladisch.de>
To: David Henningsson <david.henningsson@canonical.com>
Cc: ALSA Development Mailing List <alsa-devel@alsa-project.org>,
	Colin Guthrie <gmane@colin.guthr.ie>
Subject: Re: Lost dB volumes on USB headset between 2.6.38 and 3.0
Date: Tue, 09 Aug 2011 12:39:57 +0200	[thread overview]
Message-ID: <4E410E7D.8050903@ladisch.de> (raw)
In-Reply-To: <4E410361.7010808@canonical.com>

David Henningsson wrote:
> Hmm, I and Colin Guthrie have found a regression between kernels 2.6.38
> and 3.0.
> 
> When running "amixer -D hw:handset" for this device under 2.6.38, the
> attached file is returned. Under 3.0, the dB information is missing.
> This can't be intentional, can it?

There are patches that might have introduced bugs, but these two patches
do remove dB information intentionally:

ALSA: usb-audio - Don't expose broken dB ranges:
http://git.alsa-project.org/?p=alsa-kernel.git;a=commitdiff;h=59bb7f0eebe6
ALSA: usb-audio - Add volume range check and warn if it too big:
http://git.alsa-project.org/?p=alsa-kernel.git;a=commitdiff;h=80acefff3bc7

Are there any messages in the system log when loading the driver?
What are the controls' dB ranges (see "amixer contents")?


Regards,
Clemens

  reply	other threads:[~2011-08-09 10:35 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-09  9:52 Lost dB volumes on USB headset between 2.6.38 and 3.0 David Henningsson
2011-08-09 10:39 ` Clemens Ladisch [this message]
2011-08-09 11:19   ` David Henningsson
2011-08-09 11:19   ` Colin Guthrie
2011-08-09 12:40     ` Takashi Iwai
2011-08-16 12:31       ` Colin Guthrie
2011-08-16 13:41         ` David Henningsson
2011-08-16 14:00         ` Raymond Yau
2011-08-18 15:18         ` Takashi Iwai
2011-08-18 22:55           ` Raymond Yau
2011-08-19  5:53             ` Takashi Iwai
2011-08-19  6:15               ` Takashi Iwai
2011-08-23  3:02                 ` Raymond Yau
2011-09-03 11:11           ` Colin Guthrie
     [not found] <mailman.806.1313679978.2087.alsa-devel@alsa-project.org>
2011-08-19  2:19 ` Alex Wolfson

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