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Richard Marzan 04-18-2008 01:15 AM

Sound jack isolations
On Tue, 2008-01-29 at 21:11 -0500, Richard Marzan wrote:
> On Tuesday 29 January 2008, Marzan, Richard non Unisys wrote:
> > I tried googling around but no helpful content so far. I have a
> > laptop with built-in sound. It uses the HDA_intel kernel module. My
> > problem is that I can't silence the onboard/built-in speakers when I
> > plug in the headphones to the machine. Muting sound would lead to all
> > jacks and audio ports to be silenced -- not just the built-in
> > speakers, which I intend to mute solely leaving sound alive on the
> > headphone jacks. There are no channels readily observable to
> > differentiate where sound goes and to which port with alsa-mixer. The
> > behavior I would like to achieve is one that will allow me to mute
> > onboard speakers while continuing to have the headphones receive
> > audio signals. Has anyone ever done this? Any pointers to
> > documentation will be appreciated.
> Is it a Dell with an ICH8 chipset? This is a well known bug and is fixed
> in alsa-1.0.15. I have this same problem on my Dell D830 which runs
> Gentoo and Ubuntu.
> On Ubuntu I use a backported kernel and
> 'options snd-hda-intel model=dell-m42' in /etc/modprobe.d/alsa-base

There was someone who asked for me to keep him or her updated with this
effort and this is why I'm posting back to the post with this info.

Well, a few months later and sound jack sound isolation issue is
corrected. Upgrade to ALSA-DRIVER 1.0.16 and you should be fine. You
might have to unmask it. Sound now ceases to emanate from my speakers
when headphones are plugged into my laptop (HP dv6645us). All thanks to
Tobin Davis and the alsa-project and a surprise from emerge --sync &&
emerge -uDNtv world

Here is my output from the alsa-info shell script, I hope this helps
someone out:

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