I did upgrade the BIOS a few weeks ago when I was running 13.10. Unfortunately, this didn't change anything. I am now running 14.04 with the latest apt-get and the results are the same.
> What happened? Upon cold boot or restart, the screen brightness is set to maximum even if my setting wasn't. > Output of the command "sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date" G6ET99WW (2.59 ) 11/19/2013 One thing I noticed is that when the machine boots and the "lenovo" logo is displayed, the screen brightness is set to maximum, which leads to believe that UEFI runtime services may not be setting the brightness variable properly so it isn't persistent. -- 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/1221790 Title: 8086:0166 [ThinkPad X1 Carbon] Screen brightness is maximum upon fresh boot Status in “linux” package in Ubuntu: Incomplete Bug description: Hello, Trouble: Everytime I restart or cold boot my Thinkpad X1 laptop, my screen brightness is set to maximum. Expected Behaviour: Brighteness setting is retained between reboots My laptop uses UEFI. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-3.11.0-4-generic 3.11.0-4.9 ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7 Uname: Linux 3.11.0-4-generic x86_64 ApportVersion: 2.12.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: anmar 1798 F.... pulseaudio Date: Fri Sep 6 11:20:05 2013 HibernationDevice: RESUME=UUID=2e39ee55-2a87-4298-a2d0-1c8ef5de5a96 InstallationDate: Installed on 2013-08-09 (27 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130809) MachineType: LENOVO 3443CTO MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-4-generic.efi.signed root=UUID=1784df7c-8b5f-4550-84f2-13e73c2915fe ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-4-generic N/A linux-backports-modules-3.11.0-4-generic N/A linux-firmware 1.113 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/29/2013 dmi.bios.vendor: LENOVO dmi.bios.version: G6ET96WW (2.56 ) dmi.board.asset.tag: Not Available dmi.board.name: 3443CTO dmi.board.vendor: LENOVO dmi.board.version: Win8 STD 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:bvrG6ET96WW(2.56):bd04/29/2013:svnLENOVO:pn3443CTO:pvrThinkPadX1Carbon:rvnLENOVO:rn3443CTO:rvrWin8STDDPKTPG:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 3443CTO dmi.product.version: ThinkPad X1 Carbon dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1221790/+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
