Public bug reported:

Using the NVIDIA chipset MCP51:

00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio
(rev a2)

Which seems to use the Intel driver for sound:

[EMAIL PROTECTED]:/usr/src/linux$ lsmod|grep snd
snd_hda_intel         305888  4 
snd_pcm_oss            50048  0 
snd_mixer_oss          19712  1 snd_pcm_oss
snd_pcm                94600  3 snd_hda_intel,snd_pcm_oss
snd_seq_oss            38464  0 
snd_seq_midi_event      9344  1 snd_seq_oss
snd_seq                63264  4 snd_seq_oss,snd_seq_midi_event
snd_timer              27464  3 snd_pcm,snd_seq
snd_seq_device          9876  2 snd_seq_oss,snd_seq
snd                    71464  14 
snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_seq,snd_timer,snd_seq_device
soundcore              10400  1 snd
snd_page_alloc         11984  2 snd_hda_intel,snd_pcm

On an HP Pavilion Slimline s7700n computer, the sound driver does not
sense when I plug in headphones to the jack in the front.  The hardware
has the capability of sensing when a jack is plugged in/unplugged to the
headphone jack, as Windows mutes the rear audio output when a headphone
is plugged in.  The current setup in Feisty has a switch to disable the
headphone jack, but nothing to monitor that jack for the headphone being
plugged in to mute the main audio output.  I am wondering if it is
because it is detecting the ALC883 as an ALC888, which it is not.

This problem exists both in the Feisty ALSA driver, and the driver that
is presently (as of yesterday) in release candidate status from the ALSA
people.

Directions on https://help.ubuntu.com/community/DebuggingSoundProblems
have been followed, and attachments are coming shortly.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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snd_hda_intel (alc883 chipset) does not perform jack sense
https://bugs.launchpad.net/bugs/114053
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