[alsa-devel] [bug] Volume at maximum when track with different frequency is played with my RME sound card

[Takashi Iwai]

On Sat, 21 Nov 2015 18:42:06 +0100,
Maeda wrote:
> 
> Hi !
> 
> Thanks for answering me.
> Yes, turning the output volume up or down as soon as it's playing at 
> full output : it plays at the % it should play.
> 
> I'm OK to try the patch, but I don't find the /rme96.c/ file. Where is 
> it located ? I think a recompilation's needed then ? Never done that.

Well, you need to learn how to compile the kernel.  It's possible to
compile only a module from the current running tree, too.

Which distro are you using?  You can ask distro guys for assistance.


Takashi

> 
> Thanks for help.
> 
> Kind regards.
> 
> Le 20/11/2015 17:34, Takashi Iwai a écrit :
> > On Tue, 10 Nov 2015 13:41:44 +0100,
> > Maeda wrote:
> >> Hi !
> >>
> >> Someone's here ?
> >>
> >> Thanks.
> >>
> >> Le 23/10/2015 18:30, Maeda a écrit :
> >>> Hi all !
> >>>
> >>> I don't know if the bug is known from your team, but some people
> >>> advice me to send an email to the Alsa devel list if nobody answer in
> >>> the kernel's bugtracking.
> >>>
> >>> Here is the bug I have :
> >>> https://bugzilla.kernel.org/show_bug.cgi?id=105771
> >>>
> >>> What do you think about it ?
> > Does the volume go down when you adjust DAC volume by mixer
> > application when this happens?
> >
> > Through a quick glance at the driver code, the only smelling part is
> > that it's calling snd_rme96_reset_dac() from
> > snd_rme96_playback_setrate().  If the DAC volume adjustment really
> > works, the patch below might work.  Please give it a try.
> >
> > The patch has a code to give some delay that is commented out for
> > now.  The delay is found in the resume path, but I'm not sure whether
> > it's mandatory.  So let's try at first without the delay.  If it's
> > unstable, you can uncomment the line and retry.
> >
> >
> > thanks,
> >
> > Takashi
> >
> > ---
> > diff --git a/sound/pci/rme96.c b/sound/pci/rme96.c
> > index 714df906249e..a9d8a66fc3da 100644
> > --- a/sound/pci/rme96.c
> > +++ b/sound/pci/rme96.c
> > @@ -741,6 +741,9 @@ snd_rme96_playback_setrate(struct rme96 *rme96,
> >   	{
> >   		/* change to/from double-speed: reset the DAC (if available) */
> >   		snd_rme96_reset_dac(rme96);
> > +		/* usleep_range(3000, 10000); */
> > +		if (RME96_HAS_ANALOG_OUT(rme96))
> > +			snd_rme96_apply_dac_volume(rme96);
> >   	} else {
> >   		writel(rme96->wcreg, rme96->iobase + RME96_IO_CONTROL_REGISTER);
> >   	}
> >
> >
> >
> >
>