[alsa-devel] Very faint sound on Dell Latitude E6500

[Takashi Iwai]

At Thu, 29 Jan 2009 22:33:19 +0100,
Laurent Pinchart wrote:
> 
> On Thursday 29 January 2009, Takashi Iwai wrote:
> > At Thu, 29 Jan 2009 02:47:45 +0100,
> >
> > Laurent Pinchart wrote:
> > > Hi Takashi,
> > >
> > > On Wednesday 28 January 2009, Takashi Iwai wrote:
> > > > At Tue, 27 Jan 2009 16:51:56 +0100, Laurent Pinchart wrote:
> > > > > Hi everybody,
> > > > >
> > > > > I've received a brand new Dell Latitude E6500 and found out that the
> > > > > sound card wasn't exactly well supported by ALSA.
> > > > >
> > > > > Sound is barely audible (so faint that I'm not even sure if the
> > > > > proper sound is output or if I just get garbage), with some loud
> > > > > noise here and there that seem to correspond to the saturated audio
> > > > > data  parts.
> > > > >
> > > > > The sound card is an HDA-Intel with an IDT 92HD71B7X codec. Hardware
> > > > > information can be found at
> > > > > http://www.alsa-project.org/db/?f=30cac30e5b1ddd9c842481a830c250cc3e5
> > > > >93b0 d. A
> > > >
> > > > Please run with --no-upload and included the result in the post.
> > >
> > > Done, output included in this e-mail.
> > >
> > > > Anyway, this problem might be related with the volume-knob.
> > > > Install hda-verb and try the following
> > > >
> > > > 	hda-verb /dev/snd/hwC0D0 0x28 SET_VOLUME_KNOB 0xff
> > > > or
> > > > 	hda-verb /dev/snd/hwC0D0 0x28 SET_VOLUME_KNOB 0
> > >
> > > Unfortunately none of those make a difference.
> >
> > After doing this, check /proc/asound/card0/codec* whether this node
> > 0x28 is really changed.
> 
> Yes it does (the range is 0x00-0x7f and not 0x00-0xff).

The bit 7 is to specify the direct mode.
Maybe we need to select the input of the widget beforehand:

	% hda-verb /dev/snd/hwC0D0 0x28 SET_CONN 1
	% hda-verb /dev/snd/hwC0D0 0x28 SET_VOLUME_KNOB 0xff


Takashi