It is not necessary to upgrade to quantal fro kernel 3.4
One can use Ubuntu mainline kernel ppa:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/
** Changed in: alsa-driver (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/941219
Title:
[Acer Aspire 8930G] Speaker Sound does not mute when Headphones are
connected. Ubuntu 12.04 LTS. Missing Auto-Mute Mode in alsamixer.
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