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

[Laurent Pinchart]

On Thursday 29 January 2009, Takashi Iwai wrote:
> At Thu, 29 Jan 2009 14:27:49 +0100,
>
> Laurent Pinchart wrote:
> > Hi Takashi,
> >
> > On Thursday 29 January 2009, Takashi Iwai wrote:
> > > At Thu, 29 Jan 2009 02:47:45 +0100, Laurent Pinchart wrote:
> > > > 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=30cac30e5b1ddd9c842481a830c250c
> > > > > >c3e5 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.
> > >
> > > Then, try the latest alsa-driver snapshot from
> > >
> > > ftp://ftp.kernel.org/pub/linux/kernel/people/tiwai/snapshot/alsa-driver
> > >-sna pshot.tar.gz
> > >
> > > This contains more fixes since 1.0.19.  It's generated from the GIT
> > > tree below:
> > >     git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git
> > >
> > > git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/alsa-driver-build.g
> > >it
> >
> > I will test the snapshot this evening.
> >
> > > Also, check the headphone output at first.  The speaker output needs
> > > more work than the headphone in general.
> >
> > The headphone output works properly with the stock 2.6.28 kernel without
> > having to mess with volume-knob. I haven't tested it with alsa-driver
> > 1.0.19 yet.
>
> Ah, so only the speaker output is the problem?

Yes that's right, at least as long as analog output is concerned. I haven't 
tested the HDMI output (there is no HDMI connector on the laptop itself, and 
I don't have a docking station) and the analog inputs (internal microphone 
and external input) yet.

Best regards,

Laurent Pinchart