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[Launchpad Bug Tracker <1218744@xxxxxxxxxxxxxxxxxx>]

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[HARDWARE]
Lenovo G580 (2689-7LJ)

[OS]
ubuntu 12.04.3-64bit point release(clean install in UEFI mode)

[TITLE]
Fn+F6 does not work with kernel option "acpi_backlight=vendor".

[How To Reproduce]
1. edit /etc/default/grub & add "acpi_backlight=vendor"

	GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
					or
	GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

2. sudo update-grub

3. reboot

[Actual Result]
Fn+F6(touchpad enable/disable) does not work.

[Expected Result]
Fn+F6 toggle -> appear notification -> touchpad enable/disable

[Workaround]
kernel option(acpi_backlight=vendor) is remove.
but Fn+up/down(brightness) can not control.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.8.0-29-generic 3.8.0-29.42~precise1 [modified: boot/vmlinuz-3.8.0-29-generic]
ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: amd64
Date: Fri Aug 30 14:44:05 2013
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=ja_JP.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug precise running-unity
-- 
Fn+F6 does not work with kernel option "acpi_backlight=vendor".
https://bugs.launchpad.net/bugs/1218744
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