From: David Henningsson <david.henningsson@canonical.com>
To: alsa-devel@alsa-project.org
Subject: Re: alsactl adds volume controls?
Date: Mon, 30 Aug 2010 15:01:29 +0200 [thread overview]
Message-ID: <4C7BABA9.1010100@canonical.com> (raw)
In-Reply-To: <s5h4oec8r6f.wl%tiwai@suse.de>
2010-08-30 10:01, Takashi Iwai skrev:
> At Sat, 28 Aug 2010 06:58:20 +0800,
> Raymond Yau wrote:
>>
>> 2010/8/28 David Henningsson <david.henningsson@canonical.com>
>>
>>> 2010-08-27 17:43, Clemens Ladisch skrev:
>>>> David Henningsson wrote:
>>>>> So I've discovered that my sound card has a "PCM Playback Volume"
>>>>> control, but changing that control does not alter the volume.
>>>>>
>>>>> Interestingly enough, this control does not come from the HDA parser, it
>>>>> is added by alsactl at boot time...!
>>>>
>>>> This control was created by the software volume plugin. When not using
>>>> this plugin, the control does not have any effect.
>>>>
>>>> To get rid of it, delete its entry from /etc/asound.state.
>>>
>>> Hmm, I wonder if this is an Ubuntu-specific bug then? Because when I run
>>> Maverick (the upcoming Ubuntu release) from a Live-CD, the "PCM Playback
>>> Volume" control is still there (and there is no asound.state, neither in
>>> /etc or in /var/lib/alsa).
>>> When I use the plughw interface, the "PCM Playback Volume" does not
>>> affect volume output. Should I use another device string to test the
>>> softvol plugin, to see if it's there or not?
>>>
>>
>> The softvol plugin it is defined in "front" device in
>> /usr/share/alsa/cards/HDA-Intel.conf
>>
>> reason is some HDA codec does not has any hardware volume control (analog)
>>
>> this user-defined control only effective when the application use "front"
>> device
>
> Hm, but if PA opens the device with SND_PCM_NO_SOFTVOL flag, the
> softvol should be skipped.
But that does not apply to the mixer controls as well, does it? I think
we still have a problem with PA assuming that it can change the PCM
volume control to change the output volume.
--
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic
next prev parent reply other threads:[~2010-08-30 13:01 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-27 14:39 alsactl adds volume controls? David Henningsson
2010-08-27 15:43 ` Clemens Ladisch
2010-08-27 18:36 ` David Henningsson
2010-08-27 22:58 ` Raymond Yau
2010-08-30 8:01 ` Takashi Iwai
2010-08-30 9:30 ` Raymond Yau
2010-08-30 11:09 ` Takashi Iwai
2010-08-30 13:01 ` David Henningsson [this message]
2010-08-30 13:08 ` Takashi Iwai
2010-09-01 13:26 ` David Henningsson
2010-09-01 14:06 ` Raymond Yau
2010-09-02 8:06 ` Takashi Iwai
2010-09-02 9:24 ` David Henningsson
2010-09-02 9:44 ` Takashi Iwai
2010-09-03 7:03 ` David Henningsson
2010-09-03 7:07 ` Jaroslav Kysela
2010-10-02 0:51 ` Raymond Yau
2010-09-03 7:23 ` Raymond Yau
2010-09-02 14:10 ` Jaroslav Kysela
2010-09-02 14:21 ` Clemens Ladisch
2010-09-02 15:24 ` Jaroslav Kysela
2010-09-02 15:52 ` Clemens Ladisch
2010-09-02 17:28 ` Jaroslav Kysela
2010-09-02 20:28 ` Sebastian H.
2010-09-29 14:26 ` Colin Guthrie
2010-09-29 18:09 ` Mark Brown
2010-09-30 9:17 ` Raymond Yau
2010-09-30 11:03 ` Clemens Ladisch
2010-09-30 15:09 ` Colin Guthrie
2010-09-30 15:56 ` Clemens Ladisch
2010-09-30 16:47 ` Mark Brown
2010-09-30 18:09 ` Takashi Iwai
2010-09-30 18:20 ` Colin Guthrie
2010-09-30 20:36 ` Mark Brown
2010-10-01 6:44 ` Clemens Ladisch
2010-10-01 8:19 ` Colin Guthrie
2010-10-01 9:02 ` Clemens Ladisch
2010-10-04 11:35 ` Colin Guthrie
2010-10-04 12:26 ` Clemens Ladisch
2010-10-04 14:01 ` Takashi Iwai
2010-10-07 8:05 ` Clemens Ladisch
2010-10-08 13:21 ` Colin Guthrie
2010-10-08 13:41 ` Clemens Ladisch
2010-10-08 14:05 ` Colin Guthrie
2010-10-08 14:16 ` Colin Guthrie
2010-10-08 14:42 ` Clemens Ladisch
2010-10-08 15:25 ` Colin Guthrie
2010-10-08 15:29 ` Colin Guthrie
2010-10-08 15:49 ` Colin Guthrie
2010-10-12 8:51 ` Colin Guthrie
2010-10-15 8:32 ` Clemens Ladisch
2010-10-15 8:32 ` [PATCH 1/2] ALSA: HDA: Sigmatel: work around incorrect master muting Clemens Ladisch
2010-10-15 8:33 ` [PATCH 2/2] tlv: fix returned dB information for min-is-mute controls Clemens Ladisch
2010-10-15 8:39 ` alsactl adds volume controls? Colin Guthrie
2010-10-16 15:49 ` Colin Guthrie
2010-10-17 8:50 ` Takashi Iwai
2010-10-17 11:22 ` Colin Guthrie
2010-10-08 15:49 ` Clemens Ladisch
2010-10-11 1:34 ` Raymond Yau
2010-10-11 8:25 ` Colin Guthrie
2010-10-12 8:37 ` Raymond Yau
2010-10-17 3:39 ` Raymond Yau
2010-10-17 11:18 ` Colin Guthrie
2010-10-04 14:18 ` Alexander E. Patrakov
2010-10-04 11:09 ` Raymond Yau
2010-10-04 11:38 ` Colin Guthrie
2010-10-06 0:05 ` Raymond Yau
2010-10-06 23:29 ` Colin Guthrie
2010-10-01 5:38 ` Raymond Yau
2010-10-03 7:37 ` Raymond Yau
2010-10-23 11:51 ` Raymond Yau
2010-10-23 13:00 ` Colin Guthrie
2010-10-24 11:49 ` Raymond Yau
2010-08-29 1:35 ` Raymond Yau
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