Public bug reported:
Backlight control does not work, but there are entries in
/sys/class/backlight.
ls /sys/class/backlight > backlight
grep -r . /proc/acpi > acpi
sudo acpidump -o acpidump.txt
acpixtract acpidump.txt
iasl -d DSDT.dat
sudo fwts > fwts
sudo fwts method > fwts_method
dmesg | grep 'ACPI: Video' > video
sudo dmidecode > dmidecode.log
cat /proc/version > version
Testing for a work around
Reboot with only the kernel parameter acpi_backlight=vendor
does not work
ls /sys/class/backlight > vendorbacklight
No such folder /sys/class/backlight/intel_backlight/
Reboot with just kernel parameter video.use_bios_initial_backlight=0
does not work
reboot with just kernel parameter video.use_native_backlight=1
does not work
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-43-generic 3.13.0-43.72
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: vidya 1832 F.... pulseaudio
/dev/snd/controlC0: vidya 1832 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Dec 14 16:16:27 2014
HibernationDevice: RESUME=UUID=42b35770-926b-43cf-8874-b5452e26b5e5
InstallationDate: Installed on 2014-12-13 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: LENOVO 80E3
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic.efi.signed
root=UUID=7eccd389-f558-421b-928a-541b3f1c16f0 ro quiet splash vt.handoff=7
video.use_native_backlight=1
RelatedPackageVersions:
linux-restricted-modules-3.13.0-43-generic N/A
linux-backports-modules-3.13.0-43-generic N/A
linux-firmware 1.127.10
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/26/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: A2CN25WW(V1.07)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lancer 5B2
dmi.board.vendor: LENOVO
dmi.board.version: SDK0F82990 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo G50-45
dmi.modalias:
dmi:bvnLENOVO:bvrA2CN25WW(V1.07):bd08/26/2014:svnLENOVO:pn80E3:pvrLenovoG50-45:rvnLENOVO:rnLancer5B2:rvrSDK0F82990WIN:cvnLENOVO:ct10:cvrLenovoG50-45:
dmi.product.name: 80E3
dmi.product.version: Lenovo G50-45
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
** Attachment added: "required files"
https://bugs.launchpad.net/bugs/1402365/+attachment/4280895/+files/BugReportBacklight.tar.gz
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https://bugs.launchpad.net/bugs/1402365
Title:
Backlight Bug
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