Hi Joseph,
Thank you for the quick response.
I tested this with the intel-drm-next kernel and the one you suggested and get
the exact same behavior. It seems like a regression, because this was not
needed on 16.04/16.10.
I marked it as confirmed and added the tag, thanks you.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1683445
Title:
E6430 brightness control not working
Status in linux package in Ubuntu:
Confirmed
Bug description:
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.
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