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[Harry P <1519282@xxxxxxxxxxxxxxxxxx>]

Quick question in the meantime -- I have some vague notions that there
are two different ways for an OS to boot, UEFI and the old bios way --
when I installed wily, I remember messing about trying to get EFI to
work.  Could that have made a difference?

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https://bugs.launchpad.net/bugs/1519282

Title:
  Keyboard backlight stopped working after upgrade to Wily

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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.

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