Public bug reported:

Option stopped working after upgrading to 15.10, full light all time
(before with some hacking it was working, but still was lacking keeping
the levels between reboots)

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-18-generic 4.2.0-18.22
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ab         2051 F.... pulseaudio
CurrentDesktop: KDE
Date: Sat Nov 14 22:44:57 2015
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=33abcad5-3750-4855-b97b-2d5b0fb864ee
InstallationDate: Installed on 2013-10-24 (751 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U4E/540U4E
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic 
root=UUID=f467e962-e87d-4a39-a861-79138b4809d1 ro quiet splash resume=/dev/sdb2 
vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-18-generic N/A
 linux-backports-modules-4.2.0-18-generic  N/A
 linux-firmware                            1.149.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/05/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P07ACM.063.130905.dg
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP530U4E-K02PL
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SEC_SW_REVISION_1234567890ABCD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP07ACM.063.130905.dg:bd09/05/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U4E/540U4E:pvrP07ACM:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP530U4E-K02PL:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 530U4E/540U4E
dmi.product.version: P07ACM
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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


** Tags: amd64 apport-bug wily

** Attachment added: "(no way to add more files here)"
   
https://bugs.launchpad.net/bugs/1516320/+attachment/4519186/+files/acpidump.txt

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https://bugs.launchpad.net/bugs/1516320

Title:
  Cannot change backlight on my laptop

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