[HP Envy 14] Inconsistent volume slider using headphones

[Dario Ruellan]

Hewlett-Packard HP Envy 14 1095la
Hardware: https://wiki.ubuntu.com/druellan/hpenvy1095la

Using headphones and keyboard shortcuts to control the volume slider, something is not right when the volume is close to mute.

What I spect:
Volume to raise smoothly from mute to max

What I get:
Volume suddenly rises to 15% at the second or third "step" of the volume slider.

Test:
Using keyboard shortcuts, rise volume to max and then to the minimun (muted).
Then slowly start to rise. Alsamixer shows:

0: master 0 | headphone 68 | pcm 0 -- muted
1: master 16 | headphone 0 | pcm 100 -- muted
2: master 16 | headphone 0 | pcm 100 -- muted
3: master 18 | headphone 100 | pcm 100 -- volume ~15%

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-utils 1.0.25-1ubuntu5
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic-pae 3.2.27
Uname: Linux 3.2.0-30-generic-pae i686
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
CheckboxSubmission: 1c569236429244c2837ef2720aaa3765
CheckboxSystem: b845c366ea09c60efa3a45c1b5b21525
Date: Sat Sep 8 11:06:39 2012
ExecutablePath: /usr/bin/alsamixer
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
SourcePackage: alsa-utils
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu laptop testing tracker.

A list of all reports related to this bug can be found here:
http://laptop.qa.ubuntu.com/qatracker/reports/bugs/1047864

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for alsa-driver (Ubuntu) because there has been no activity for 60 days.]