Problem solved.
Tried adding acpi_backlight=vendor to boot parameter. Did not work
So I tried the recommendation for Intel HD Graphic Controllers.
Created the file /usr/share/X11/xorg.conf.d/80-backlight.conf with below
contents as recommended.
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that
works here
BusID "PCI:0:2:0"
EndSection
Problem Solved.
I am still running the upstream kernel at this time. Will reboot into
the final release kernel and report as to whether this works in that
kernel as well.
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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/1307064
Title:
Ubuntu 14.04 Beta cannot adjust brightness on Lenovo Ideapad Z570
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Fresh install of 14.04 on my laptop cannot adjust brightness. When
fn+up arrow or fn+down arrow are used, the indicator in the upper
right hand corner as if the brightness should change, but it does not.
Also, if one tries to use the slider in the power applet, the
brightness does not change.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.46
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: will 2960 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Apr 12 21:36:57 2014
HibernationDevice: RESUME=UUID=dfa51f33-0f34-4383-8194-93656983323d
InstallationDate: Installed on 2014-04-13 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
MachineType: LENOVO 10249RU
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed
root=UUID=7420c61f-1836-4a44-84dc-71573190ff4c ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-24-generic N/A
linux-backports-modules-3.13.0-24-generic N/A
linux-firmware 1.127
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/21/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 45CN38WW
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Emerald Lake
dmi.board.vendor: LENOVO
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnLENOVO:bvr45CN38WW:bd10/21/2011:svnLENOVO:pn10249RU:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
dmi.product.name: 10249RU
dmi.product.version: Ideapad Z570
dmi.sys.vendor: LENOVO
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