[pulseaudio-tickets] [Bug 39612] RHEL6.1 there is no connector in the tab of Input/Output of Sound Preferences

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39612

Colin Guthrie <fdo at colin.guthr.ie> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |NOTOURBUG

--- Comment #10 from Colin Guthrie <fdo at colin.guthr.ie> 2011-07-29 04:04:19 PDT ---
If you look at the mixer controls for your card (search for the text, "Mixer
controls for card 0 [PCH]" in the alsa-info output), you can see that the alsa
driver does not expose controls for the various connectors/ports on your
hardware.

This can happen for two reasons:
 1) The driver simply does not support this.
 2) The driver is not able to automatically work out the model of your
soundcard.

If the latter is the problem you can potentially fix the issue by specifying
the specific model via a setting in /etc/modprobe.d/ for the snd-hda-intel
driver.

Your codec (ALC662) has several models listed here:
http://www.kernel.org/doc/Documentation/sound/alsa/HD-Audio-Models.txt

It is very much worth trying the different models manually, as the correct
model may not be automatically detected correctly. If a model is found that
gives you a fuller amixer -c0 output, then PA should hopefully be able to pick
them up and use them.

You will have to make sure that the model= setting only applies to your sound
card itself and not the HDMI sound output (which also uses the snd-hda-intel
driver). I think there is some magic in the modprobe.d file that achieves
this).


But either way, this is sadly not something we can fix in PulseAudio itself.
It's something that needs to be addressed at a kernel level in alsa.

I suggest liaising with RHEL bugzilla and perhaps posting to alsa-devel mailing
list directly if you are confident enough in taking the issue forward yourself.
Otherwise your support contract with RHEL will likely allow them to pursue the
issue on your behalf (tho' I won't pretend to know much about the technical
details here!!).

All the best and if you need any further advise etc, please feel free to leave
further comments.

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