Lenovo Flex 3-1580 (80R4) Intel Backlight Issues

[Michael Murphy]

This laptop suffers from the same issue as just about every Intel laptop I've used. xbacklight will not adjust brightness unless acpi_backlight=none is set in /etc/default/grub and the grub configuration rebuilt to use it as a kernel command line option.

As a separate but related issue, the backlight keys do not work at all for this laptop, and I haven't yet figured out a solution for that.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-34-generic 4.4.0-34.53
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: karen 3647 F.... pulseaudio
CurrentDesktop: GNOME
Date: Sun Aug 14 16:14:31 2016
HibernationDevice: RESUME=UUID=94e950bd-4474-40e8-93c8-d9fb78cffee3
InstallationDate: Installed on 2016-08-12 (2 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 8087:0a2a Intel Corp.
 Bus 001 Device 003: ID 04f3:2089 Elan Microelectronics Corp.
 Bus 001 Device 002: ID 04f2:b50f Chicony Electronics Co., Ltd
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 80R4
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/usr/bin/fish
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.4.0-34-generic.efi.signed root=UUID=eebf5f5f-0e70-4f2c-ae02-0a3d2218ea40 ro rootflags=subvol=@ quiet splash acpi_osi=Linux acpi_backlight=none vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-34-generic N/A
 linux-backports-modules-4.4.0-34-generic N/A
 linux-firmware 1.157.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/09/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: D3CN28WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Flex 3-1580
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Flex 3-1580
dmi.modalias: dmi:bvnLENOVO:bvrD3CN28WW:bd05/09/2016:svnLENOVO:pn80R4:pvrFlex3-1580:rvnLENOVO:rnFlex3-1580:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrFlex3-1580:
dmi.product.name: 80R4
dmi.product.version: Flex 3-1580
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.8 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8-rc2/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]