display brightness not working

[rahuldeepak]

Using intel dual_core processor i just upgrade lts-16.04 to ubuntu 18.04 now i unable to reduce or increase brightness

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.17.0-6-generic 4.17.0-6.7
ProcVersionSignature: Ubuntu 4.17.0-6.7-generic 4.17.9
Uname: Linux 4.17.0-6-generic i686
ApportVersion: 2.20.10-0ubuntu7
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: rahul 1460 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 8 19:43:11 2018
HibernationDevice: RESUME=UUID=88199ab0-6838-4b90-a76c-b652cdaa92e7
InstallationDate: Installed on 2018-08-03 (4 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release i386 (20170801)
MachineType: LENOVO INVALID
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.17.0-6-generic root=UUID=f569a9d4-9d61-428a-9277-bcfd42fe2e8c ro quiet splash acpi_backlight=video vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.17.0-6-generic N/A
 linux-backports-modules-4.17.0-6-generic N/A
 linux-firmware 1.174
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to cosmic on 2018-08-07 (0 days ago)
dmi.bios.date: 12/26/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 4FCNA1WW
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Base Board Product Name
dmi.board.vendor: LENOVO
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnLENOVO:bvr4FCNA1WW:bd12/26/2011:svnLENOVO:pnINVALID:pvrLenovoB460e:rvnLENOVO:rnBaseBoardProductName:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.family: Intel_Mobile
dmi.product.name: INVALID
dmi.product.version: Lenovo B460e
dmi.sys.vendor: LENOVO

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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 v4.18 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'.

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/v4.18-rc8

[Launchpad Janitor (janitor)]

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