Hi Shang,
It looks like this issue might have been already resolved upstream.
Could you please try following the instructions here:
https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS
...and see if it helps?
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/856173
Title:
[Satellite U300, Realtek ALC268, Green Headphone Out, Front] No
automute
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