So for one reason or another I ended up reinstalling the OS, and it's now booting in traditional BIOS mode rather than EFI, and sure enough the backlight works again. Not sure whether that means this should be marked against a different package?
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1519282/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
