** Changed in: linux-lts-saucy (Ubuntu) Status: Confirmed => Fix Released
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-lts-raring in Ubuntu. https://bugs.launchpad.net/bugs/1270079 Title: [Lenovo T540p, W540] Backlight interfaces not fully working Status in linux-lts-raring package in Ubuntu: Fix Released Status in linux-lts-saucy package in Ubuntu: Fix Released Bug description: This is a system installed with 12.04.3. Brightness can be controlled in "Systems Settings" > "Brightness and Lock" > Brightness slider. However there are three interfaces, /sys/class/backlight$ ls acpi_video0 acpi_video1 intel_backlight By controlling each interfaces as following command: $ sudo sh -c 'echo 80 > brightness' here is the findings: acpi_video*/brighness can be only controll by particular values like, 80, 40, 22, 12, 8, 5 ,3,1 intel_backlight/brightness can adjust from 0 to 4789. three interfaces are not synchronized, this cause an issue for other tools that uses acpi_video0 or acpi_video1 on this system. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.8.0-35-generic 3.8.0-35.50~precise1 ProcVersionSignature: Ubuntu 3.8.0-35.50~precise1-generic 3.8.13.13 Uname: Linux 3.8.0-35-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-35-generic. ApportVersion: 2.0.1-0ubuntu17.6 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 1: PCH [HDA Intel PCH], device 0: ALC292 Analog [ALC292 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ubuntu 1751 F.... pulseaudio /dev/snd/controlC0: ubuntu 1751 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'MID'/'HDA Intel MID at 0xf2630000 irq 48' Mixer name : 'Intel Haswell HDMI' Components : 'HDA:80862807,80860101,00100000' Controls : 21 Simple ctrls : 3 Card1.Amixer.info: Card hw:1 'PCH'/'HDA Intel PCH at 0xf2634000 irq 49' Mixer name : 'Realtek ALC292' Components : 'HDA:10ec0292,17aa2210,00100001' Controls : 22 Simple ctrls : 10 Card29.Amixer.info: Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown' Mixer name : 'ThinkPad EC (unknown)' Components : '' Controls : 1 Simple ctrls : 1 Card29.Amixer.values: Simple mixer control 'Console',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] CurrentDmesg: [ 40.050791] type=1400 audit(1389947716.229:28): apparmor="DENIED" operation="open" parent=1 profile="/usr/lib/telepathy/mission-control-5" name="/usr/share/gvfs/remote-volume-monitors/" pid=1974 comm="mission-control" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0 Date: Fri Jan 17 03:40:35 2014 HibernationDevice: RESUME=UUID=619bafb8-b790-472c-9471-181ae33c4dd2 InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: LENOVO 20BFZ052US MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-35-generic root=UUID=4fde570e-2674-44ba-8c05-5626a382ef7b ro quiet splash thinkpad-acpi brightness_enable=1 initcall_debug vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-35-generic N/A linux-backports-modules-3.8.0-35-generic N/A linux-firmware 1.79.6 SourcePackage: linux-lts-raring UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/09/2013 dmi.bios.vendor: LENOVO dmi.bios.version: GMET21WW (1.01 ) dmi.board.asset.tag: Not Available dmi.board.name: 20BFZ052US dmi.board.vendor: LENOVO dmi.board.version: Win8 Pro DPK TPG dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrGMET21WW(1.01):bd08/09/2013:svnLENOVO:pn20BFZ052US:pvrThinkPadT540p:rvnLENOVO:rn20BFZ052US:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 20BFZ052US dmi.product.version: ThinkPad T540p dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1270079/+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