At Sat, 28 Aug 2010 06:58:20 +0800, Raymond Yau wrote: > > 2010/8/28 David Henningsson <david.henningsson@xxxxxxxxxxxxx> > > > 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. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
