Screen Brightness problem

[Gabriel]

well..when I first installed my Ubuntu 14.04, my brightness button was working just fine, but now, when I try to do it, it gets kind of laggy and doesn't adjust the screen, only the brightness of the own bar changes a little.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-39-generic 3.13.0-39.66
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: gabriel 1943 F.... pulseaudio
 /dev/snd/controlC0: gabriel 1943 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Nov 2 20:40:57 2014
HibernationDevice: RESUME=UUID=de2ff4cd-739d-4f17-a680-84402466ec9f
InstallationDate: Installed on 2014-11-01 (1 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: LENOVO 20377
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic.efi.signed root=UUID=1c13abd2-044c-411b-afeb-e00263afe26a ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-39-generic N/A
 linux-backports-modules-3.13.0-39-generic N/A
 linux-firmware 1.127.7
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/14/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: 9FCN21WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lenovo Flex 2-15D
dmi.board.vendor: LENOVO
dmi.board.version: 31900058 Std
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Flex 2-15D
dmi.modalias: dmi:bvnLENOVO:bvr9FCN21WW:bd05/14/2014:svnLENOVO:pn20377:pvrLenovoFlex2-15D:rvnLENOVO:rnLenovoFlex2-15D:rvr31900058Std:cvnLENOVO:ct10:cvrLenovoFlex2-15D:
dmi.product.name: 20377
dmi.product.version: Lenovo Flex 2-15D
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.18 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-rc3-vivid/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]