This commit upstream in kernel 3.2-rc4 sounds relevant:
ALSA: hda - Fix jack-detection control of VT1708
author Takashi Iwai
Thu, 24 Nov 2011 15:33:09 +0000 (16:33 +0100)
committer Takashi Iwai
Sun, 27 Nov 2011 16:56:17 +0000 (17:56 +0100)
commit 187d333edc0a8e1bb507900ce89853ffe3bd2c84
tree 06ffc1d0be94ec00157f790aa152e91addf0800b
parent 92bb43e6aae3dbdb199feba93da5f2d05d7716d0
ALSA: hda - Fix jack-detection control of VT1708
VT1708 has no support for unsolicited events per jack-plug, the driver
implements the workq for polling the jack-detection. The mixer element
"Jack Detect" was supposed to control this behavior on/off, but this
doesn't work properly as is now. The workq is always started and the
HP automute is always enabled.
This patch fixes the jack-detect control behavior by triggering / stopping
the work appropriately at the state change. Also the work checks the
internal state to continue scheduling or not.
Cc: <[email protected]> [v3.1]
Signed-off-by: Takashi Iwai
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https://bugs.launchpad.net/bugs/689590
Title:
[VIA VT1708] Alsamixer crashes on toggling "Jack detect"
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