Kamalakar Agashe, the next step is to fully reverse commit bisect from kernel 3.13 to 4.0 in order to identify the last bad commit, followed immediately by the first good one. Once this commit has been identified, then it may be reviewed as a candidate for backporting into your release. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ?
Please note, finding adjacent kernel versions is not fully commit bisecting. Thank you for your understanding. Helpful bug reporting tips: https://wiki.ubuntu.com/ReportingBugs ** Changed in: linux (Ubuntu) Status: Expired => 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/1402365 Title: Backlight Bug Status in linux package in Ubuntu: Incomplete Bug description: Backlight control does not work, but there are entries in /sys/class/backlight. ls /sys/class/backlight > backlight grep -r . /proc/acpi > acpi sudo acpidump -o acpidump.txt acpixtract acpidump.txt iasl -d DSDT.dat sudo fwts > fwts sudo fwts method > fwts_method dmesg | grep 'ACPI: Video' > video sudo dmidecode > dmidecode.log cat /proc/version > version Testing for a work around Reboot with only the kernel parameter acpi_backlight=vendor does not work ls /sys/class/backlight > vendorbacklight No such folder /sys/class/backlight/intel_backlight/ Reboot with just kernel parameter video.use_bios_initial_backlight=0 does not work reboot with just kernel parameter video.use_native_backlight=1 does not work WORKAROUND: Install fglrx. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-43-generic 3.13.0-43.72 ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11 Uname: Linux 3.13.0-43-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: vidya 1832 F.... pulseaudio /dev/snd/controlC0: vidya 1832 F.... pulseaudio CurrentDesktop: Unity Date: Sun Dec 14 16:16:27 2014 HibernationDevice: RESUME=UUID=42b35770-926b-43cf-8874-b5452e26b5e5 InstallationDate: Installed on 2014-12-13 (0 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: LENOVO 80E3 ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic.efi.signed root=UUID=7eccd389-f558-421b-928a-541b3f1c16f0 ro quiet splash vt.handoff=7 video.use_native_backlight=1 RelatedPackageVersions: linux-restricted-modules-3.13.0-43-generic N/A linux-backports-modules-3.13.0-43-generic N/A linux-firmware 1.127.10 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/26/2014 dmi.bios.vendor: LENOVO dmi.bios.version: A2CN25WW(V1.07) dmi.board.asset.tag: No Asset Tag dmi.board.name: Lancer 5B2 dmi.board.vendor: LENOVO dmi.board.version: SDK0F82990 WIN dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo G50-45 dmi.modalias: dmi:bvnLENOVO:bvrA2CN25WW(V1.07):bd08/26/2014:svnLENOVO:pn80E3:pvrLenovoG50-45:rvnLENOVO:rnLancer5B2:rvrSDK0F82990WIN:cvnLENOVO:ct10:cvrLenovoG50-45: dmi.product.name: 80E3 dmi.product.version: Lenovo G50-45 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402365/+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
