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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

This kernel version 3.11.0-12 is pretty old, looking at the commits
since there have been a number of backlight related fixes.  Could you
update to the latest kernel and confirm it is still present.

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https://bugs.launchpad.net/bugs/1272124

Title:
  Backlight control does not work on linux mint - acer aspire 5741

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Backlight control does not work, but there are entries in
  /sys/class/backlight

  System: linux Mint 16 on Acer Aspire 5741

  I will follow the debugging method on:
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight

  
  1) ls /sys/class/backlight
   acer-wmi  intel_backlight

  2) grep -r . /proc/acpi
   /proc/acpi/button/lid/LID0/state:state:      open
  grep: /proc/acpi/event: Dispositivo o risorsa occupata
  /proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
  /proc/acpi/wakeup:AZAL	  S3	*disabled  pci:0000:00:1b.0
  /proc/acpi/wakeup:P0P1	  S4	*disabled  pci:0000:00:1e.0
  /proc/acpi/wakeup:EHC1	  S3	*enabled   pci:0000:00:1d.0
  /proc/acpi/wakeup:USB1	  S3	*disabled
  /proc/acpi/wakeup:USB2	  S3	*disabled
  /proc/acpi/wakeup:USB3	  S3	*disabled
  /proc/acpi/wakeup:USB4	  S3	*disabled
  /proc/acpi/wakeup:USB5	  S3	*disabled
  /proc/acpi/wakeup:USB6	  S3	*disabled
  /proc/acpi/wakeup:USB7	  S3	*disabled
  /proc/acpi/wakeup:RP01	  S4	*disabled  pci:0000:00:1c.0
  /proc/acpi/wakeup:PEG5	  S4	*disabled

  3) dmesg | grep 'ACPI: Video' > video 
  [    8.291555] ACPI: Video Device [GFX0] (multi-head: yes  rom: yes  post: no)

  4)/proc/version
  Linux version 3.11.0-12-generic (buildd@allspice) (gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu7) ) #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013

  5) reboot with only the kernel parameter acpi_backlight=vendor
  now its disappeared also the OSD info

  6)ls -la /sys/class/backlight/intel_backlight
  lrwxrwxrwx 1 root root 0 gen 23 23:56 /sys/class/backlight/intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight

  7)Reboot with just kernel parameter video.use_bios_initial_backlight=0
  nothing change (but the OSD is returned)

  8) echo 8 | sudo tee /sys/class/backlight/intel_backlight/brightness
  it's works..

  9)showkey -s
  fn+left (0x...)
  e0 4c e0 cc
  e0 56 e0 d6

  fn+right (0x...)
  e0 54 e0 d4

  10) ... any ideas?

  ps: i've attached the intel acpi info DTDT.dsl

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tia        1844 F.... pulseaudio
  Date: Fri Jan 24 00:25:00 2014
  HibernationDevice: RESUME=UUID=1f0244d2-61fe-4fd4-9a24-f425d6811bf2
  InstallationDate: Installed on 2014-01-23 (0 days ago)
  InstallationMedia: Linux Mint 16 "petra" - Release amd64 20131126
  MachineType: Acer Aspire 5741
  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-3.11.0-12-generic root=UUID=13480b77-86cb-4a3d-b2ea-a4006b469683 ro quiet splash acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/22/2010
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.06
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire 5741
  dmi.board.vendor: Acer
  dmi.board.version: V1.06
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.06
  dmi.modalias: dmi:bvnAcer:bvrV1.06:bd04/22/2010:svnAcer:pnAspire5741:pvrV1.06:rvnAcer:rnAspire5741:rvrV1.06:cvnAcer:ct10:cvrV1.06:
  dmi.product.name: Aspire 5741
  dmi.product.version: V1.06
  dmi.sys.vendor: Acer

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