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[Bruno Nova <1172945@xxxxxxxxxxxxxxxxxx>]

I have a laptop of the same model. With "acpi_osi=Linux" the brightness
Fn keys work but the graphical system sliders/notifications don't (which
is not a very big problem for me).

Another way of changing the brightness, for those laptops that use integrated Intel graphics like this one, is using the "intel_backlight" command in the terminal.
For example, "sudo intel_backlight 10" should change the brightness to around 10% (yes, sudo is required).
You can use this command to set the brightness even lower than what the brightness Fn keys allow.
I think this command is in the "intel-gpu-tools" package (it may already be installed) and should work even from a live CD.

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https://bugs.launchpad.net/bugs/1172945

Title:
  Acer Aspire 5742G brightness Fn keys doesn't change brightness

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  On my Acer Aspire 5742G, the brightness function keys actually shows the brightness notification and changes its bar, but doesn't change the display brightness.
  I tried to add the acpi_backlight=vendor line on GRUB_CMDLINE_LINUX_DEFAULT variable and update grub, but it doesn't do anything.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified: boot/vmlinuz-3.8.0-19-generic]
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Fri Apr 26 00:26:31 2013
  HibernationDevice: RESUME=UUID=6a7bba52-468e-4dee-8cf5-de71c5d262aa
  InstallationDate: Installed on 2013-04-25 (0 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer Aspire 5742G
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=ad2201cc-75ef-47fe-85ff-614ad2fec58e ro quiet splash acpi_backlight=vendor
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/13/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.30
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire 5742G
  dmi.board.vendor: Acer
  dmi.board.version: V1.30
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.30
  dmi.modalias: dmi:bvnAcer:bvrV1.30:bd08/13/2012:svnAcer:pnAspire5742G:pvrV1.30:rvnAcer:rnAspire5742G:rvrV1.30:cvnAcer:ct10:cvrV1.30:
  dmi.product.name: Aspire 5742G
  dmi.product.version: V1.30
  dmi.sys.vendor: Acer

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