kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Resolved in Saucy due to
https://bugzilla.kernel.org/show_bug.cgi?id=42993#c17 .

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/863156

Title:
  Brightness unchangeable via keyboard or brightness applet Acer Aspire
  5750-9668

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  1) lsb_release -rd
  Description:	Ubuntu precise (development branch)
  Release:	12.04

  lsb_release -rd
  Description: Ubuntu oneiric (development branch)
  Release: 11.10

  2) uname -a
  Linux monikerpc 3.4.0-030400rc1-generic #201203312035 SMP Sun Apr 1 00:43:10 UTC 2012 i686 i686 i386 GNU/Linux

  apt-cache policy xfce4-power-manager-plugins
  xfce4-power-manager-plugins:
    Installed: 1.0.10-4
    Candidate: 1.0.10-4
    Version table:
   *** 1.0.10-4 0
          500 http://archive.ubuntu.com/ubuntu/ oneiric/universe i386 Packages
          100 /var/lib/dpkg/status

  uname -a
  Linux monikerpc 3.0.0-12-generic-pae #20-Ubuntu SMP Fri Oct 7 16:37:17 UTC 2011 i686 i686 i386 GNU/Linux

  http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.2-rc4-oneiric/
  uname -r 3.2.0-030200rc4-generic

   apt-cache policy xfce4-power-manager-plugins
  xfce4-power-manager-plugins:
    Installed: 1.0.11-0ubuntu1
    Candidate: 1.0.11-0ubuntu1
    Version table:
   *** 1.0.11-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
          100 /var/lib/dpkg/status

  3) What is expected to happen when one presses the Fn key and the Left
  or Right arrow, the brightness goes up or down respectively.

  4) What happens is the brightness does not change and remains at 100%
  no matter what.

  WORKAROUND: Changing /etc/default/grub from:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

  to:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

  save, sudo update-grub then restarting allowed brightness applet or
  keyboard Fn and Right or Left to change brightness.

  Following the debug info
  at:https://wiki.ubuntu.com/Kernel/Debugging/Backlight

  this issue falls into the "Backlight control does not work, but there
  are entries in /sys/class/backlight" category.

  lsmod | grep thinkpad_acpi

  does not yield any information.

  No such path as: /proc/acpi/video

  Following: https://wiki.ubuntu.com/BIOSandUbuntu#Buggy%20DSDT

  sudo acpidump -o acpidump.txt && acpixtract acpidump.txt
  Acpi table [DSDT] - 36436 bytes written to DSDT.dat
  Acpi table [SSDT] - 3010 bytes written to SSDT1.dat
  Acpi table [SSDT] - 2316 bytes written to SSDT2.dat
  Acpi table [SSDT] - 2454 bytes written to SSDT3.dat

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/863156/+attachment/2490437/+files/acpixtract.zip

  iasl -d DSDT.dat

  Intel ACPI Component Architecture
  AML Disassembler version 20100528 [Oct 15 2010]
  Copyright (c) 2000 - 2010 Intel Corporation
  Supports ACPI Specification Revision 4.0a

  Loading Acpi table from file DSDT.dat
  Acpi table [DSDT] successfully installed and loaded
  Pass 1 parse of [DSDT]
  Pass 2 parse of [DSDT]
  Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
  ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
  Parsing completed

  Found 5 external control methods, reparsing with new information
  Pass 1 parse of [DSDT]
  Pass 2 parse of [DSDT]
  Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
  ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
  Parsing completed
  Disassembly completed, written to "DSDT.dsl"
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/863156/+attachment/2528912/+files/DSDT.dsl

  sudo fwts
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/863156/+attachment/2490447/+files/results.log

  sudo fwts method
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/863156/+attachment/2490450/+files/results.log

  Changing the "xfce4-brightness-plugin 1.0.10" to half way down goes
  from:

  /sys/class/backlight/intel_backlight$ grep . /sys/class/backlight/acpi_video0/*
  /sys/class/backlight/acpi_video0/actual_brightness:9
  /sys/class/backlight/acpi_video0/bl_power:0
  /sys/class/backlight/acpi_video0/brightness:9
  /sys/class/backlight/acpi_video0/max_brightness:9
  /sys/class/backlight/acpi_video0/type:firmware

  to:

  /sys/class/backlight/intel_backlight$ grep . /sys/class/backlight/acpi_video0/*
  /sys/class/backlight/acpi_video0/actual_brightness:5
  /sys/class/backlight/acpi_video0/bl_power:0
  /sys/class/backlight/acpi_video0/brightness:5
  /sys/class/backlight/acpi_video0/max_brightness:9
  /sys/class/backlight/acpi_video0/type:firmware

  Clicking on keyboard Fn and Left arrow together once goes from:

  /sys/class/backlight/intel_backlight$ grep . /sys/class/backlight/acpi_video0/*
  /sys/class/backlight/acpi_video0/actual_brightness:9
  /sys/class/backlight/acpi_video0/bl_power:0
  /sys/class/backlight/acpi_video0/brightness:9
  /sys/class/backlight/acpi_video0/max_brightness:9
  /sys/class/backlight/acpi_video0/type:firmware

  to:

  grep . /sys/class/backlight/acpi_video0/*
  /sys/class/backlight/acpi_video0/actual_brightness:7
  /sys/class/backlight/acpi_video0/bl_power:0
  /sys/class/backlight/acpi_video0/brightness:7
  /sys/class/backlight/acpi_video0/max_brightness:9
  /sys/class/backlight/acpi_video0/type:firmware

  dmesg|grep 'ACPI: Video'
  [ 4.181103] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)

  lspci |grep VGA
  00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-12-generic-pae 3.0.0-12.19
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic-pae 3.0.4
  Uname: Linux 3.0.0-12-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu2
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER PID ACCESS COMMAND
   /dev/snd/controlC0: moniker 1750 F.... xfce4-volumed
                        moniker 1798 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc0700000 irq 50'
     Mixer name : 'Intel CougarPoint HDMI'
     Components : 'HDA:10ec0269,10250504,00100100 HDA:80862805,80860101,00100000'
     Controls : 20
     Simple ctrls : 11
  Date: Fri Sep 30 06:05:13 2011
  EcryptfsInUse: Yes
  InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.3)
  MachineType: Acer Aspire 5750
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic-pae root=UUID=af001e50-f2b3-44af-a197-164b20aa8c44 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-12-generic-pae N/A
   linux-backports-modules-3.0.0-12-generic-pae N/A
   linux-firmware 1.60
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/11/2011
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.05
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: JE50_HR
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.05
  dmi.modalias: dmi:bvnAcer:bvrV1.05:bd02/11/2011:svnAcer:pnAspire5750:pvrV1.05:rvnAcer:rnJE50_HR:rvrBaseBoardVersion:cvnAcer:ct10:cvrV1.05:
  dmi.product.name: Aspire 5750
  dmi.product.version: V1.05
  dmi.sys.vendor: Acer

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