Does pressing the "disable sound" hardware button actually mute the
sound? If not, the latest upstream kernel 2.6.37-rc1 may help. From
the changelog:
commit 6cb3b707f95954ac18f19b4b3919af235738371a
Author: David Henningsson
Date: Thu Sep 9 08:51:44 2010 +0200
ALSA: HDA: Add fixup pins for Ideapad Y550
By adding the subwoofer as a speaker pin, it is treated correctly when
auto-muting.
BugLink: https://launchpad.net/bugs/611803
Signed-off-by: David Henningsson
Signed-off-by: Takashi Iwai
A PPA of this kernel is available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/
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Lenovo Yxx0 mute indicator not work
https://bugs.launchpad.net/bugs/543086
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