[bisected] snd_hda_intel, 2.6.37: automuting on headphone connectbroken; headphone connecter no longer shown in userspace

[Nirbheek Chauhan]

Hello,

Upon upgrading to 2.6.37,
auto-muting-laptop-speakers-on-headphone-connect stopped working, and
the headphone connector completely disappeared from alsamixer as well
as the pulseaudio volume control panel. The headphone jack was still
transmitting sound, though.

I bisected the problem, with 'good' being v2.6.36, and found the
commit below as the first bad commit. Reverting it on v2.6.37 fixes
the problem. I also tried the latest alsa-kernel master git tree,
which had the same problem.

alsa-info when 'good':

http://www.alsa-project.org/db/?f=a0b5c95f764a0b01746be46f989685996e1f9210

alsa-info when 'bad':

http://www.alsa-project.org/db/?f=30f30ca5461f03b98ab6c7c611cf24ea4526f537

Note: both were taken without X running, before pulseaudio came up.

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03642c9a444079aa13f0864383a8f9ca04bfd198 is the first bad commit
commit 03642c9a444079aa13f0864383a8f9ca04bfd198
Author: Takashi Iwai <tiwai@xxxxxxx>
Date:   Wed Sep 8 15:28:19 2010 +0200

    ALSA: hda - Clear left-over hp_pins in snd_hda_parse_pin_def_config()

    In snd_hda_parse_def_config(), some unused values may remain in hp_pins[]
    array during the headphone-reassignment workaround.  This patch clears
    the unused array members.

    Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>

:040000 040000 34724336a75f74263423f28d64450d65e5ed948d
8d136fce8661ad2df35ac3c4a9ca1c712c9833ed M	sound

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The patch was:

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