Christopher, do you mean BIOS version 2.53? That's the newest I could find. Anyway, by updating to 2.53 (from 2.52) and removing the 'GRUB_CMDLINE_LINUX="acpi_backlight=vendor"' line from /etc/default/grub, it now works as expected.
Thanks for the suggestion! Just for reference: eeroz@eeroz-ThinkPad-W530:~$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date Swipe your right index finger across the fingerprint reader G5ET93WW (2.53 ) 05/24/2013 -- 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/1173352 Title: [ThinkPad W530 2447] Brightness keys don't work as expected on Status in “linux” package in Ubuntu: Incomplete Bug description: First I could only change the brightness level by one step. (From 100% to 95%.) After I added 'GRUB_CMDLINE_LINUX="acpi_backlight=vendor"' in /etc/default/grub the keys work as expected, but the notification showing the brightness level displays the wrong value. Attached a picture with max brightness. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-3.8.0-19-generic 3.8.0-19.29 ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8 Uname: Linux 3.8.0-19-generic x86_64 ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: eeroz 2273 F.... pulseaudio CRDA: country DE: (2400 - 2483 @ 40), (N/A, 20) (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS (5470 - 5725 @ 40), (N/A, 26), DFS Date: Fri Apr 26 21:54:04 2013 HibernationDevice: RESUME=UUID=c4d094e7-893d-4e8a-a869-fa08eb2b2d9c InstallationDate: Installed on 2012-12-23 (123 days ago) InstallationMedia: This MachineType: LENOVO 24472AG MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=b08558b9-9514-435a-8b9c-c012eb0fd91b ro acpi_backlight=vendor quiet splash i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-19-generic N/A linux-backports-modules-3.8.0-19-generic N/A linux-firmware 1.106 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: Upgraded to raring on 2013-04-25 (1 days ago) dmi.bios.date: 02/27/2013 dmi.bios.vendor: LENOVO dmi.bios.version: G5ET92WW (2.52 ) dmi.board.asset.tag: Not Available dmi.board.name: 24472AG 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:bvrG5ET92WW(2.52):bd02/27/2013:svnLENOVO:pn24472AG:pvrThinkPadW530:rvnLENOVO:rn24472AG:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 24472AG dmi.product.version: ThinkPad W530 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173352/+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
