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 v4.3 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/v4.3-wily/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1517467 Title: Function brightness keys do not change brightness. Status in linux package in Ubuntu: Incomplete Bug description: This is occurring on a Lenovo y510p machine running Ubuntu 15.10. My machine has a double Nvidia GT750M setup, running the latest Nvidia tested drivers (352.41) I have read that installing the nvidiabl driver might help but I wasn't able to succeed installing https://github.com/guillaumezin/nvidiabl in my system. I have attempted editing GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub to "quiet splash acpi_osi=Linux acpi_backlight=vendor" with no success. I have also attempted adding Option "RegistryDwords" "EnableBrightnessControl=1" to my nvidia xorg config file with no success. I managed a workaround solution by mapping keyboard shortcuts to the commands xbacklight -inc 5 and xbacklight -dec 5. 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 NonfreeKernelModules: nvidia ApportVersion: 2.19.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: hao 1642 F.... pulseaudio /dev/snd/controlC0: hao 1642 F.... pulseaudio CurrentDesktop: Unity Date: Wed Nov 18 04:51:45 2015 HibernationDevice: RESUME=UUID=6dfe08a3-bcd0-426c-b311-9bbf0e166496 InstallationDate: Installed on 2015-10-31 (18 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: LENOVO 20217 ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic.efi.signed root=UUID=609b882f-3a8a-4853-b2a1-6c518137b96f ro quiet splash acpi_osi=Linux acpi_backlight=vendor 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: 07/18/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 74CN35WW(V1.10) dmi.board.asset.tag: YB00949273 dmi.board.name: 20217 dmi.board.vendor: LENOVO dmi.board.version: 31900003Std dmi.chassis.asset.tag: YB00949273 dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo IdeaPad Y510P dmi.modalias: dmi:bvnLENOVO:bvr74CN35WW(V1.10):bd07/18/2013:svnLENOVO:pn20217:pvrLenovoIdeaPadY510P:rvnLENOVO:rn20217:rvr31900003Std:cvnLENOVO:ct10:cvrLenovoIdeaPadY510P: dmi.product.name: 20217 dmi.product.version: Lenovo IdeaPad Y510P dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1517467/+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
