Comment 19 for bug 1083984

Sorry for the delayed response. Fn+Space turns the keyboard backlight and
Thinklight on, but does nothing for the screen brightness. Please also see
this report: https://bugzilla.kernel.org/show_bug.cgi?id=51131

Aaron at the end says we're depending on Nvidia for brightness control. Is
this true?

Thanks,
Matt

On Sun, Mar 3, 2013 at 4:23 PM, Chris Johnston <<email address hidden>
> wrote:

> Matt, can you do me a favor please.. Try pressing Fn+Space a couple of
> times.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1083984
>
> Title:
> Brightness control doesn't work on Lenovo Thinkpad T530
>
> Status in “linux” package in Ubuntu:
> Triaged
>
> Bug description:
> Following instructions on
> https://wiki.kubuntu.org/Kernel/Debugging/Backlight
>
> I have tried in /etc/default/grub: kernel parameters
> acpi_backlight=vendor, thinkpad-acpi.brightness_enable=1.
>
> I have tried /usr/share/X11/xorg.conf.d/10-brightness-control.conf:
> Option "RegistryDwords" "EnableBrightnessControl=1"
>
> I have tried editing /sys/class/backlight/acpi_video0/brightness with
> tee
>
> None of these have enabled brightness control. If I boot with
> integrated graphics instead of Nvidia, it works fine. (Note: this
> laptop has Optimus). Any further suggestions?
>
> ProblemType: Bug
> DistroRelease: Ubuntu 12.10
> Package: linux-image-3.5.0-18-generic 3.5.0-18.29
> ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
> Uname: Linux 3.5.0-18-generic x86_64
> ApportVersion: 2.6.1-0ubuntu6
> Architecture: amd64
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC1: mwhite 2138 F.... pulseaudio
> /dev/snd/controlC0: mwhite 2138 F.... pulseaudio
> Date: Tue Nov 27 23:39:07 2012
> HibernationDevice: RESUME=UUID=c574cd15-a9b9-4064-b22e-62b5bf4ce531
> InstallationDate: Installed on 2012-11-27 (0 days ago)
> InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64
> (20121017.5)
> MachineType: LENOVO 2359CTO
> MarkForUpload: True
> ProcEnviron:
> TERM=xterm
> PATH=(custom, no user)
> XDG_RUNTIME_DIR=<set>
> LANG=en_US.UTF-8
> SHELL=/bin/bash
> ProcFB: 0 nouveaufb
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic.efi.signed
> root=UUID=fdfd5708-06eb-454a-a3c7-bdd98054c811 ro quiet splash vt.handoff=7
> RelatedPackageVersions:
> linux-restricted-modules-3.5.0-18-generic N/A
> linux-backports-modules-3.5.0-18-generic N/A
> linux-firmware 1.95
> SourcePackage: linux
> UpgradeStatus: No upgrade log present (probably fresh install)
> dmi.bios.date: 09/13/2012
> dmi.bios.vendor: LENOVO
> dmi.bios.version: G4ET62WW (2.04 )
> dmi.board.asset.tag: Not Available
> dmi.board.name: 2359CTO
> 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:bvrG4ET62WW(2.04):bd09/13/2012:svnLENOVO:pn2359CTO:pvrThinkPadT530:rvnLENOVO:rn2359CTO:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
> dmi.product.name: 2359CTO
> dmi.product.version: ThinkPad T530
> dmi.sys.vendor: LENOVO
>
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