This bug was fixed in the package unity-settings-daemon -
15.04.1+18.04.20180413-0ubuntu1.1
---------------
unity-settings-daemon (15.04.1+18.04.20180413-0ubuntu1.1) bionic; urgency=medium
[ Kai-Heng Feng ]
* power: Choose correct backlight device on laptops with hybrid graphics
(LP: #1683445)
Backported from gnome-settings-daemon commit ed7c2744
-- Sebastien Bacher <seb...@ubuntu.com> Tue, 03 Jul 2018 11:27:01
+0200
** Changed in: unity-settings-daemon (Ubuntu Bionic)
Status: Fix Committed => Fix Released
--
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https://bugs.launchpad.net/bugs/1683445
Title:
E6430 brightness control not working
Status in GNOME Settings Daemon:
Fix Released
Status in Nouveau Xorg driver:
Won't Fix
Status in OEM Priority Project:
Confirmed
Status in gnome-settings-daemon package in Ubuntu:
Fix Released
Status in unity-settings-daemon package in Ubuntu:
Fix Released
Status in gnome-settings-daemon source package in Xenial:
Confirmed
Status in unity-settings-daemon source package in Xenial:
Fix Committed
Status in gnome-settings-daemon source package in Zesty:
Fix Released
Status in unity-settings-daemon source package in Zesty:
Won't Fix
Status in unity-settings-daemon source package in Bionic:
Fix Released
Bug description:
Impact
------
It looks like GNOME's brightness control simply used the first backlight
device it saw instead of one currently in use. This meant that the brightness
control would not work on some computers with multiple GPUs.
Test Case
---------
From Ubuntu GNOME 17.04 on a dual-GPU computer, install the update.
Restart.
Does the brightness control now work correctly?
Regression Potential
--------------------
This looks like a minimal fix for this issue. It was accepted as part of
gnome-settings-daemon 3.24.2 which all GNOME 3.24 distros will be upgrading to.
Original Bug Report
-------------------
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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