When headphones are plugged in, the speaker does not get muted automatically.

[NoOp]

Anyone have any suggestions for resolving issues in the following bug?
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/477154
[When headphones are plugged in, the speaker does not get muted
automatically.]

Fairly new HP G60-530US laptop w/9.10 and it's annoying as hell that I'm
not able to get the system to mute the speakers when the headphones are
plugged in. My data/comments start at #71:
<https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/477154/comments/71>

Note: Jatin has a similar/same issue in the "Sound Coming in headphones
as well as speakers" thread.