[HP Envy 14] Inconsistent brightness control using switcheable graphics

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

What I expect:
Consistent brightness indicator, consistent use of keyboard shortcuts while using both integrated and dedicated graphic adapters.

What I get:
Using the Intel integrated adapter:
- Keyboard shortcuts work
- Indicator shows only 5 levels of brightness, from 10 real working levels
- Brightness settings slider does NOT change the brightness in any way
- At bootup the brightness resets to 0 (backlight off).

Using the dedicated adapter:
- Keyboard shortcuts does NOT work
- Indicator does NOT work
- Brightness settings slider does NOT change the brightness in any way
- At bootup the brightness resets to 0 (backlight off).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-power-manager 3.4.0-0ubuntu1
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 12:26:10 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-power-manager
UpgradeStatus: No upgrade log present (probably fresh install)