What version of Ubuntu are you using?
By LED, do you mean a "plugged-in" status light or is it an optical jack?
uname -a
Please attach the out put of:
cat /proc/asound/card*/codec*
and
** Changed in: linux (Ubuntu)
Sourcepackagename: None => linux
Status: New => Incomplete
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sound card led doesn't work in lenovo y500
https://bugs.launchpad.net/bugs/272129
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