kernel-packages team mailing list archive

[Filipe Dias <filipesdias@xxxxxxxxx>]

Hi,

Brightness controls work on Ubuntu 12.04 with the raring ringtail kernel
3.8 and the liquorix kernel. 3.12.6. But for the system to launch with
the brightness on, the user has to edit /etc/default/grub and change
this line like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""

On Ubuntu 13.10, the brightness controls do not work with these kernel
versions. Changing GRUB_CMDLINE_LINUX_DEFAULT also doesn't work.

- kernel 3.11 (the default one)
- kernel 3.12.6 (installed with these instructions)
- kernel 3.12.6 liquorix

Also, /sys/class/backlight is empty on 13.10, while on 12.0.4.3 it has
two folders "acpi_video0" and "intel_backlight"

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1258058

Title:
  10de:0fe4 [Lenovo IdeaPad Y510P] Brightness control no effect on
  screen

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Brightness control no effect on screen, I managed to get control over brightness by using xbacklight.
  My issue (laptop and everything else) is exactly the same as this one http://ubuntuforums.org/showthread.php?t=2167180

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-14-generic 3.11.0-14.21
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  radenkovich   2284 F.... pulseaudio
   /dev/snd/controlC0:  radenkovich   2284 F.... pulseaudio
  Date: Thu Dec  5 09:45:30 2013
  HibernationDevice: RESUME=UUID=ea9a6ac1-13ea-4060-9ef9-60a3309bd921
  InstallationDate: Installed on 2013-11-11 (23 days ago)
  InstallationMedia: This
  MachineType: LENOVO 20217
  MarkForUpload: True
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic.efi.signed root=UUID=aec56d0c-f753-4e40-948a-34e69d7dfca6 ro "acpi_osi=!Windows 2012"
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-14-generic N/A
   linux-backports-modules-3.11.0-14-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/22/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 74CN41WW(V2.07)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: VIQY0Y1
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900004STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y510P
  dmi.modalias: dmi:bvnLENOVO:bvr74CN41WW(V2.07):bd08/22/2013:svnLENOVO:pn20217:pvrLenovoIdeaPadY510P:rvnLENOVO:rnVIQY0Y1:rvr31900004STD:cvnLENOVO:ct10:cvrLenovoIdeaPadY510P:
  dmi.product.name: 20217
  dmi.product.version: Lenovo IdeaPad Y510P
  dmi.sys.vendor: LENOVO

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