kernel-packages team mailing list archive

[Kamalakar Agashe <1402365@xxxxxxxxxxxxxxxxxx>]

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

-- 
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/1402365

Title:
  Backlight Bug

Status in linux package in Ubuntu:
  New

Bug description:
  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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402365/+subscriptions