Public bug reported:
Although the brightness keys and brightness indicator behaviour seems
normal, the actual brightness of the monitor does not change.
I've tried different solutions as the following without luck:
Changing grub to:
GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor" followed by a grub update
And changing xorg.conf adding to the Device section:
Option "RegistryDwords" "EnableBrightnessControl=1"
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-23-generic 3.5.0-23.35
ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: emrys 2550 F.... pulseaudio
/dev/snd/controlC0: emrys 2550 F.... pulseaudio
Date: Sat Feb 16 22:09:27 2013
HibernationDevice: RESUME=UUID=469f9a35-b6af-4c9e-9698-a2a00e707863
InstallationDate: Installed on 2013-02-13 (3 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 20193
MarkForUpload: True
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-23-generic
root=UUID=284bcd93-5b33-4537-85ab-eb7a40897731 ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.5.0-23-generic N/A
linux-backports-modules-3.5.0-23-generic N/A
linux-firmware 1.95
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/29/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 6BCN34WW(V1.05)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900003WIN8 STD MLT
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Y500
dmi.modalias:
dmi:bvnLENOVO:bvr6BCN34WW(V1.05):bd11/29/2012:svnLENOVO:pn20193:pvrLenovoIdeaPadY500:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadY500:
dmi.product.name: 20193
dmi.product.version: Lenovo IdeaPad Y500
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal running-unity
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https://bugs.launchpad.net/bugs/1127729
Title:
Brightness keys not working in Lenovo Y500
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