Samsung Notebook backlight doesn't change levels

[brunomelniic]

Samsung Notebook's (version P05ADG) backlight doesn't change levels, even using function keys or system apps.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-47-generic 4.4.0-47.68
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: olivia 3486 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Jan 14 19:05:14 2017
HibernationDevice: RESUME=UUID=037b9eb5-d8cf-4b0d-bd1a-baaafd5befbf
InstallationDate: Installed on 2016-11-15 (60 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 670Z5E
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-47-generic.efi.signed root=UUID=3e21c5be-6824-4131-8250-caeb22b8e3bb ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-47-generic N/A
 linux-backports-modules-4.4.0-47-generic N/A
 linux-firmware 1.157.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/21/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P05ADG.010.140421.SH
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP670Z5E-XD1BR
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.:bvrP05ADG.010.140421.SH:bd04/21/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn670Z5E:pvrP05ADG:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP670Z5E-XD1BR:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 670Z5E
dmi.product.version: P05ADG
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.10 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/v4.10-rc4

[Launchpad Janitor (janitor)]

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