[HP Pavilion 15] Volume mute LED does not work on 12.04.5

[Po-Hsu Lin]

CID: 201307-13902 HP Pavilion 15

The volume mute key works, but the on-the-key orange LED won't be lit while muted.

Alsa info:
http://www.alsa-project.org/db/?f=8afc9679c09aa5a6ee240ce1dc5e2fd0a304ccdb

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.57~precise1 [modified: boot/vmlinuz-3.13.0-32-generic]
ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Mon Aug 11 06:38:55 2014
InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-lts-trusty
UpgradeStatus: No upgrade log present (probably fresh install)