I've also noticed this situation. But I think it's not really a bug but a confused change made in power settings.
@sayantan13 can you check if you can also see the same results: Steps to verify: 1. check "Dim screen to save power" 2. in "Turn screen off when inactive for", select "2 minutes" And then wait for the system goes to inactive, you should see result with follow progress: normal -> system goes inactive (0s) -> screen dim at 30% backlight (1:30s) -> screen starting dimming again (1:50s) until black/off. If you cannot see it dimming but it still goes to black screen, not could possibility your backlight does not work at first place. -- 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/1351833 Title: [Lenovo FLex 2] Display backlight does not reduce after checking 'Dim screen to save power' Status in linux package in Ubuntu: Confirmed Bug description: Hi, I am using Ubuntu 14.04.1 LTS on Lenovo FLex 2. The laptop display backlight does not reduce even after selecting 'Dim screen to save power' in the Battery Setttings. --- ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sayantan 2009 F.... pulseaudio /dev/snd/controlC1: sayantan 2009 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=ccdc92e5-9c8d-4e92-93d6-a300e775615b InstallationDate: Installed on 2014-07-28 (5 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 04f3:0333 Elan Microelectronics Corp. Bus 001 Device 003: ID 0bda:b728 Realtek Semiconductor Corp. Bus 001 Device 002: ID 5986:055e Acer, Inc Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: LENOVO 20404 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed root=UUID=0705e595-a4d7-4cc8-8976-e8692f30f49e ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4 RelatedPackageVersions: linux-restricted-modules-3.13.0-32-generic N/A linux-backports-modules-3.13.0-32-generic N/A linux-firmware 1.127.5 Tags: trusty Uname: Linux 3.13.0-32-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 03/21/2014 dmi.bios.vendor: LENOVO dmi.bios.version: A0CN21WW dmi.board.asset.tag: No Asset Tag dmi.board.name: Lenovo Flex 2-14 dmi.board.vendor: LENOVO dmi.board.version: 31900059 Std dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Flex 2-14 dmi.modalias: dmi:bvnLENOVO:bvrA0CN21WW:bd03/21/2014:svnLENOVO:pn20404:pvrLenovoFlex2-14:rvnLENOVO:rnLenovoFlex2-14:rvr31900059Std:cvnLENOVO:ct10:cvrLenovoFlex2-14: dmi.product.name: 20404 dmi.product.version: Lenovo Flex 2-14 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1351833/+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
