From: David Henningsson <david.henningsson@canonical.com>
To: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>
Subject: alsactl adds volume controls?
Date: Fri, 27 Aug 2010 16:39:25 +0200 [thread overview]
Message-ID: <4C77CE1D.2070501@canonical.com> (raw)
So I've discovered that my sound card has a "PCM Playback Volume"
control, but changing that control does not alter the volume. This is
not only confusing but also a problem for PulseAudio. (PA merges this
control into it's overall volume, and so when the user moves PA's volume
control, in some ranges nothing happens.)
Interestingly enough, this control does not come from the HDA parser, it
is added by alsactl at boot time...! (Through alsa-lib's
snd_ctl_elem_add_integer, which does an snd_ctl_ioctl.)
So the question is, why is alsactl creating volume controls, and why is
userspace allowed to add controls in the first place, if the kernel
can't use them for anything anyway? That doesn't make sense to me.
This a generic problem, but sound card info, if that matters, is
available here:
https://launchpad.net/bugs/625149
Codec: http://launchpadlibrarian.net/54478760/Card0.Codecs.codec.0.txt
--
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic
next reply other threads:[~2010-08-27 14:39 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-27 14:39 David Henningsson [this message]
2010-08-27 15:43 ` alsactl adds volume controls? 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
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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