This is not an issue in the current Saucy kernel 3.11.0-6-generic. ** Tags added: kernel-fixed-upstream-v3.11
** Tags added: apport-collected ** Description changed: [Problem]: Pushing the brightness "down" key causes the brightess to immediately go to a value of 0 yet the actual brightness has not change on the screen. Pushing brightness "up" causes the brightness value to go up to around 5% and immediately sets the actual corresponding brightness level on the display. At this point pressing the brightness "up" or "down" keys causes the brightness slider to jump between 0 and 5% but will not go any higher value setting. You have to open gnome-control-center "brightness and lock" to reset the brightness to desired value. This particular bug is present on a few recent lenovos models. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.8.0-29-generic 3.8.0-29.42~precise1 [modified: boot/vmlinuz-3.8.0-29-generic] ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5 Uname: Linux 3.8.0-29-generic x86_64 ApportVersion: 2.0.1-0ubuntu17.4 Architecture: amd64 Date: Tue Sep 10 11:45:00 2013 InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1) MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-lts-raring UpgradeStatus: No upgrade log present (probably fresh install) + --- + AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-29-generic. + ApportVersion: 2.0.1-0ubuntu17.4 + Architecture: amd64 + ArecordDevices: + **** List of CAPTURE Hardware Devices **** + card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog] + Subdevices: 1/1 + Subdevice #0: subdevice #0 + AudioDevicesInUse: + USER PID ACCESS COMMAND + /dev/snd/controlC0: ubuntu 1563 F.... pulseaudio + CRDA: Error: [Errno 2] No such file or directory + Card0.Amixer.info: + Card hw:0 'PCH'/'HDA Intel PCH at 0xe2810000 irq 48' + Mixer name : 'Intel PantherPoint HDMI' + Components : 'HDA:10ec0269,17aa0001,00100203 HDA:80862806,80860101,00100000' + Controls : 36 + Simple ctrls : 12 + 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] + DistroRelease: Ubuntu 12.04 + HibernationDevice: RESUME=UUID=fbd820f1-0c28-488a-b1a5-90e425ff897e + InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1) + MachineType: LENOVO 20AX25C + MarkForUpload: True + Package: linux (not installed) + ProcEnviron: + TERM=xterm + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcFB: 0 inteldrmfb + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic root=UUID=5cea22e2-4925-4f99-8469-1af7456106b3 ro quiet splash initcall_debug vt.handoff=7 + ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5 + RelatedPackageVersions: + linux-restricted-modules-3.8.0-29-generic N/A + linux-backports-modules-3.8.0-29-generic N/A + linux-firmware 1.79.6 + Tags: precise running-unity + Uname: Linux 3.8.0-29-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo + dmi.bios.date: 03/26/2013 + dmi.bios.vendor: LENOVO + dmi.bios.version: HFET25WW (1.02 ) + dmi.board.asset.tag: Not Available + dmi.board.name: 20AX25C + dmi.board.vendor: LENOVO + dmi.board.version: Win8 STD PRC 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:bvrHFET25WW(1.02):bd03/26/2013:svnLENOVO:pn20AX25C:pvrThinkPadS3-S431:rvnLENOVO:rn20AX25C:rvrWin8STDPRCDPKTPG:cvnLENOVO:ct10:cvrNotAvailable: + dmi.product.name: 20AX25C + dmi.product.version: ThinkPad S3-S431 + dmi.sys.vendor: LENOVO -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1223421 Title: [Lenovo S431, 531, S5]: Brightness keys to not function properly. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1223421/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs