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I'm using a Samsung Ativ Book 9.  Keyboard backlight worked OK under
Vivid, seems to have stopped working since I installed Wily.  Can't see
any evidence of it in /sys/class.

Happy to do any further debugging if it helps.

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: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  harry      1635 F.... pulseaudio
 /dev/snd/controlC0:  harry      1635 F.... pulseaudio
CurrentDesktop: GNOME
Date: Tue Nov 24 09:45:23 2015
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=9a886cf6-b939-4fdc-9721-bbf214a10519
InstallationDate: Installed on 2015-10-15 (39 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 940X3G/930X3G
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-18-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro noprompt persistent quiet splash 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
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/19/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P05ACJ.128.140819.dg
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP940X3G-K05US
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SAMSUNG_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.:bvrP05ACJ.128.140819.dg:bd08/19/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn940X3G/930X3G:pvrP05ACJ:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP940X3G-K05US:rvrSAMSUNG_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 940X3G/930X3G
dmi.product.version: P05ACJ
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Invalid


** Tags: amd64 apport-bug kernel-bug-exists-upstream kernel-bug-exists-upstream-4.4-rc2 needs-bisect regression-release wily
-- 
Keyboard backlight stopped working after upgrade to Wily
https://bugs.launchpad.net/bugs/1519282
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