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[Alkis Georgopoulos <853244@xxxxxxxxxxxxxxxxxx>]

Hi! No, updating the BIOS didn't change anything at all.

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
V1.30
08/13/2012

I tried both with the raring kernel (3.8.0-33-generic ) on my Precise system,
and with a Trusty daily live CD, with the same results as usual.

Summary:
 * The brightness keys make the brightness window pop up, but the brightness isn't changed at all.
 * Comment #22 from ag200spr does apply to me. So it is possible to change the brightness by e.g.
   # echo 123 > /sys/class/backlight/intel_backlight/brightness
 * If I boot with `acpi_osi=Linux` in the kernel command line, I can change the brightness,
   but the brightness window doesn't pop up.

So fixing the problem should be easy, if some upstream developer was
actually interested in this.

Thanks,
Alkis

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

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https://bugs.launchpad.net/bugs/853244

Title:
  Acer Aspire 5742Z brightness keys not working

Status in The Linux Kernel:
  New
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  In 2.6.32 (Lucid) there's an
  /sys/devices/virtual/backlight/acpi_video0 interface for Aspire 5742Z,
  and brightness hotkeys do modify the values of the files in that dir,
  but the actual laptop brightness isn't changed.

  In 3.0.0-9 (Oneiric beta 1) there's no /sys/devices/virtual/backlight
  interface at all.

  If I boot with acpi=off, the brightness keys correctly modify
  brightness, but of course I lose all other ACPI functionality.

  I tried some of the other acpi-related kernel parameters (acpi_backlight=vendor etc) mentioned in
   * https://wiki.ubuntu.com/Kernel/Debugging/Backlight
   * https://wiki.ubuntu.com/DebuggingACPI
   * www.kernel.org/doc/Documentation/kernel-parameters.txt
   * http://www.lesswatts.org/projects/acpi/debug.php
  to no avail, brightness only works with acpi=off or acpi=ht.

  I tried the fwts tool for ACPI testing, and it produced some errors, I'm attaching the output.
  I also tried playing with acpiexec, but calling the _BCM method didn't change the brightness either.

  `ubuntu-bug linux` doesn't work from the oneiric beta live CD, I'll
  manually attach lspci etc as well.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-24-generic 3.2.0-24.37
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER PID ACCESS COMMAND
   /dev/snd/controlC0: alkisg 1705 F.... xfce4-volumed
                        alkisg 1736 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xb4400000 irq 44'
     Mixer name : 'Intel IbexPeak HDMI'
     Components : 'HDA:10ec0272,10250487,00100001 HDA:80862804,80860101,00100000'
     Controls : 27
     Simple ctrls : 13
  Date: Fri May 18 07:51:58 2012
  HibernationDevice: RESUME=UUID=52f7a35f-fad8-4c9d-baf1-3d3087278f3c
  InstallationMedia: Xubuntu 12.04 "Precise Pangolin" - Alpha amd64 (20120201.1)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 003: ID 064e:c21c Suyin Corp.
  MachineType: Acer Aspire 5742Z
  ProcEnviron:
   LANGUAGE=el:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=el_GR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=9ba52df4-ec9e-4e1c-bbd7-322f50437f94 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-24-generic N/A
   linux-backports-modules-3.2.0-24-generic N/A
   linux-firmware 1.79
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/10/2011
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.24
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire 5742Z
  dmi.board.vendor: Acer
  dmi.board.version: V1.24
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.24
  dmi.modalias: dmi:bvnAcer:bvrV1.24:bd08/10/2011:svnAcer:pnAspire5742Z:pvrV1.24:rvnAcer:rnAspire5742Z:rvrV1.24:cvnAcer:ct10:cvrV1.24:
  dmi.product.name: Aspire 5742Z
  dmi.product.version: V1.24
  dmi.sys.vendor: Acer

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