[alsa-devel] Very faint sound on Dell Latitude E6500
laurent.pinchart at skynet.be
Thu Jan 29 22:33:19 CET 2009
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).
> Then, try the latest alsa-driver snapshot from
> This contains more fixes since 1.0.19. It's generated from the GIT
> tree below:
I've downloaded, installed and tested the latest alsa-driver snapshot. No
change was visible (or rather audible) in the internal speakers behaviour.
> Also, check the headphone output at first. The speaker output needs
> more work than the headphone in general.
As stated in my previous e-mail, headphones work properly. Only the internal
speakers cause trouble.
> You can also try to change the power-map by
> hda-verb /dev/snd/hwC0D0 1 0x7ec 0
> This is pretty specific to IDT codecs.
Changing power-map with the above command doesn't seem to have any effect
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