Comment 0 for bug 1683445

The Dell E6430 with Nvidia Optimus enables in BIOS, using the Open Source Nouveau driver shows the brightness slider moving but does not affect the brightness.

When using the kernel boot option acpi_backlight=vendor , the brightness control works.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: linux-image-4.10.0-19-generic 4.10.0-19.21
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 2081 F.... pulseaudio
CurrentDesktop: Unity:Unity7
Date: Mon Apr 17 20:00:56 2017
HibernationDevice: RESUME=UUID=66528b53-0f42-4043-9ff8-da8f86036be6
InstallationDate: Installed on 2017-04-10 (7 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170321)
MachineType: Dell Inc. Latitude E6430
ProcFB:
 0 nouveaufb
 1 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic.efi.signed root=UUID=4e08c33d-f8cf-4159-a559-a0463d67b96c ro quiet splash acpi_backlight=vendor vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.10.0-19-generic N/A
 linux-backports-modules-4.10.0-19-generic N/A
 linux-firmware 1.164
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/18/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A18
dmi.board.name: 0H3MT5
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA18:bd01/18/2016:svnDellInc.:pnLatitudeE6430:pvr01:rvnDellInc.:rn0H3MT5:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6430
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.