Re: Lost audio on headphones (F9)

[Paulo Cavalcanti]

On Wed, Nov 26, 2008 at 9:46 AM, Paulo Cavalcanti  wrote:
> On Sat, Nov 22, 2008 at 9:19 PM, Andre Costa  wrote:
> > Hi,
> >
> > On Wed, Nov 19, 2008 at 10:15, Andre Costa  wrote:
> > > Hi Tim,
> > >
> > > On Tue, Nov 18, 2008 at 19:15, Tim  wrote:
> > > > On Tue, 2008-11-18 at 15:26 -0200, Andre Costa wrote:
> > > > > my desktop computer has one of those front headphones connectors, and
> > > > > it always worked (always = since Fedora8), playing the same audio that
> > > > > goes to the front speakers. I tried it today and it doesn't work
> > > > > anymore,
> > > >
> > > > Open up the volume controls and see if there's a separate volume control
> > > > just for the headphones.  You might have to wallow through the
> > > > preferences to add more controls.
> > >
> > > Thks for the tip, but I had already done that. There's a chekcbox for
> > > headphone, which is checked. I also tried playing with every track volume
> > > level that seemed reasonable, but it did not work.
> > >
> > > (if anyone can provide more info on any specific settings that would
> > > affect headphone sound, that'd be great...)
> > > > > my guess is that some of the recent updates might have changed
> > > > > something on audio config
> > > >
> > > > You might look through /var/log/yum.log to see what's been recently
> > > > updated, and see if they're a likely cause.
> > >
> > > I took a look, but thet fact is that I can't precise when it stopped
> > > working, so the timeframe could be long... =(
> > >
> > > Thks anyway for your help.
> > >
> > > Regards,
> > >
> > > Andre
> >
> > Just a quick update: it's a bug with the lastest kernel. Headphone works
> > with kernel 2.6.26.6-79. I filed it as bug #472317:
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=472317
>
> In fact, this happened to me when I upgraded to alsa driver 1.0.18.
> Going back to alsa-driver 1.01.7 solves the problem. I think your kernel
> is using 1.0.18, and I doubt anyone is going to fix it.
>
> The only option is reporting in the alsa-devel list , and maybe someone
> there
> can do anything about it.

Well, after some work, we found out that alsa 1.0.18 (snd-hda-intel) is
testing if something
is plugged to the front panel, to cut the sound on the back.
Unfortunately, some boards only detect the presence of jacks connected
to the back of the computer. Plugging, say a headphone, to the front does
not change anything.
Therefore, the sound on the front of the computer is never activated.

I will test an alsa patch for my codec soon. But maybe other codecs were
affected too...