Public bug reported:

Brightness keys do nothing, stuck on full brightness

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-116-generic 4.4.0-116.140
ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
Uname: Linux 4.4.0-116-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
 /dev/snd/controlC0:  forge      1895 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Feb 23 19:47:44 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-02-23 (0 days ago)
InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
MachineType: LENOVO 80R3
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-116-generic.efi.signed 
root=UUID=85451546-daae-4935-b12f-494e677b1dac ro quiet splash vt.handoff=7
 linux-restricted-modules-4.4.0-116-generic N/A
 linux-backports-modules-4.4.0-116-generic  N/A
 linux-firmware                             1.157.16
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2018-02-23 (0 days ago) 12/23/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: D3CN29WW
dmi.board.asset.tag: No Asset Tag Flex 3-1480
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 3-1480
dmi:bvnLENOVO:bvrD3CN29WW:bd12/23/2015:svnLENOVO:pn80R3:pvrFlex3-1480:rvnLENOVO:rnFlex3-1480:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrFlex3-1480: 80R3
dmi.product.version: Flex 3-1480
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Tags: amd64 apport-bug xenial

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  Brightness keys do nothing, stuck on full brightness

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