[alsa-devel] ALSA changes in 2.6.23-rc6 for Intel HDA

Maxim Levitsky maximlevitsky at gmail.com
Thu Sep 13 21:28:01 CEST 2007

On Thursday 13 September 2007 22:20:07 Jon Smirl wrote:
> On 9/13/07, Jon Smirl <jonsmirl at gmail.com> wrote:
> > On 9/13/07, Maxim Levitsky <maximlevitsky at gmail.com> wrote:
> > > Can you tell me exact version of kernel that allowed you to set higher volume,
> > > and can you test whenever you actually can set louder volumes on that kernel, maybe it has a bug
> >
> >
> > I was working fine  2.6.23-rc4 for sure and I also believe  2.6.23-rc5 was ok.
> >  2.6.23-rc6 is not ok.
> >
> > But I can't rule out that this has nothing to do with the kernel and
> > instead it was cause by an auto update of some ubuntu package.
> >
> > It is the current system that is not working ok for me.
> >
> > I have my powered speakers set to full volume.
> > I have PCM set to full volume.
> > I have to set the front speakers to 36% before I can detect they are
> > making sound.
> > I still have full dynamic range if I set the front speakers to 100%.
> >
> > Here's a another clue. I have alsamixer running in a window. I change
> > the volume control with the gnome panel applet. It is changing the
> > volume for the Front Speaker column. Shouldn't it be changing the PCM
> > column?
> >
> > If I set Front back to 79 and use PCM to control the volume things
> > appear to be working like they used to. Did something cause the Gnome
> > Volume Control Applet to start controlling a different column?
> I see now that there is a preference in the Gnome Volume Control
> applet and in System/Preferences/Sound for setting which channel is
> controlled. In both cases nothing was selected on my system. It seems
> that the default when nothing is selected is to control the Front
> Speaker channel.
> I've set both of these to PCM and now things are working like there were before.
> This behavior correlates with what I believe was the name of the PCM
> channel changing from 'pcm' to 'PCM'. The selection boxes still wanted
> to use the old name which wasn't a choice anymore.


The 'PCM" is a userspace plugin, it only allows to decrease volume
so if you set it to 100%, it will do nothing.

I used this chip back in 2.6.21 days, and I never have seen any change in volumes like that.
I use KDE, so I don't know much about gnome volume control.

Best regards,
	Maxim Levitsky

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