After bisecting the kernel releases I have determined when this bug was injected. Release 4.4.39 is OK Release 4.5-rc1 is BROKEN
64-bit Generic versions were used. After testing many releases I have discovered one additional aspect of this bug of the backlight inappropriately coming on following the exiting of the screen saver. In the broken kernels the backlight will illuminate during the "traveling dots" while the desktop GUI is starting. It remains on until manually disabled or when the screen saver exits. ** Tags added: kernel-bug-exists-upstream-4.5-rc1 -- 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/1645985 Title: ubuntu 1404_HWE_EOL kernel breaks Thinkpad T530 keyboard backlight operation Status in linux package in Ubuntu: Confirmed Bug description: Using kernel 3.19.0-66-generic the keyboard backlight and screen-top illuminator work. However, after upgrading to kernel 4.4 the keyboard backlight and screen-top illuminator come on without hitting the special keys. When it returns from screen saver when I hit the return key these lights come on also. --- ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: painter 3092 F.... pulseaudio DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=05f2d9dc-173d-41bc-8332-7d0a6e7394fa InstallationDate: Installed on 2014-11-23 (741 days ago) InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: LENOVO 2359CTO Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-51-generic root=UUID=349d96ad-2412-45a5-b1d9-46eb9050bce1 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-51.72~14.04.1-generic 4.4.30 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.4.0-51-generic N/A linux-backports-modules-4.4.0-51-generic N/A linux-firmware 1.127.22 Tags: trusty Uname: Linux 4.4.0-51-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 09/10/2015 dmi.bios.vendor: LENOVO dmi.bios.version: G4ETA5WW (2.65 ) dmi.board.asset.tag: Not Available dmi.board.name: 2359CTO dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrG4ETA5WW(2.65):bd09/10/2015:svnLENOVO:pn2359CTO:pvrThinkPadT530:rvnLENOVO:rn2359CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 2359CTO dmi.product.version: ThinkPad T530 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1645985/+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
