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[Federico Leoni <effelle@xxxxxxxxx>]

Christopher,

I reinstalled my Windows Vista from my restoration DVD just to check if brightness works and I had many difficult installing it.
I was able to install an old XP and I discovered multiple errors about ACPI and the brightness control has issues on this OS too: I can see the brightness slider moving but the luminosity don't change. I need a reflow or a moterboard replacement.
Seems Linux is enumerating periferals in a different way and is less sensible to hardware failures. 

Please, mark this bug as invalid and close it. I'll contact you again
if, after the hardware fix, the issue is still present.

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https://bugs.launchpad.net/bugs/1281176

Title:
  8086:2a02 [Dell Vostro 1310] no brightness control on (x)ubuntu 13.10
  / 14.04

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  When I press the appropriate keys on keyboard (Fn+up/Fn+down) the
  slider appears on the upper right corner of the screen but the
  brightness doesn't change.

  Problem is I have not intel_backlight on /sys/class/backlight folder
  but just acpi_video0 or dell_backlight (if I set acpi_backlight=vendor
  on grub). Since I don't have intel_backlight folder I can't apply many
  of the workaround found here and there.

  Reported upstream at http://marc.info/?l=linux-
  acpi&m=139290477319769&w=2 .

  WORKAROUND: /sys/class/backlight$ for i in /sys/class/backlight/*; do
  echo -e "\n $i"; cat $i/{brightness,max_brightness,actual_brightness};
  done

  /sys/class/backlight/acpi_video0
  1
  7
  1

  If I increase the backlight via funcion keys or terminal the files are
  correctly updated:

  $ echo 7 | sudo tee /sys/class/backlight/acpi_video0/brightness

  /sys/class/backlight/acpi_video0
  7
  7
  7

  acpi_listen works just on new mainline kernel 3.13.2 (tried bot generic and lowlatency) on stock kernel there isn't output at all:
  video/brightnessup BRTUP 00000086 00000000 K
  video/brightnessdown BRTDN 00000087 00000000 K

  Now I'm using xrandr to change the brightness:
  xrandr --output LVDS1 --brightness 0.5

  but since xrandr is a software overlay my battery life is horrible,
  I'm stuck on 100% brightness. Beside this, sometimes the brightness
  slider appears spontaneously without pressing any keys but again with
  no effect.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.25
  ProcVersionSignature: Ubuntu 3.11.0-15.25-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  effe       1526 F.... pulseaudio
  CurrentDmesg:
   [  102.704995] ERROR @wl_dev_intvar_get : error (-1)
   [  102.705003] ERROR @wl_cfg80211_get_tx_power : error (-1)
  Date: Mon Feb 17 13:27:10 2014
  HibernationDevice: RESUME=UUID=d0ee674f-0ea7-47e1-ba6f-1a849ba35941
  InstallationDate: Installed on 2014-02-10 (6 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
  MachineType: Dell Inc. Vostro1310
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=44ccbe21-7e45-468c-b942-1773a32943b0 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/18/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 0K866H
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd03/18/2009:svnDellInc.:pnVostro1310:pvrNull:rvnDellInc.:rn0K866H:rvr:cvnDellInc.:ct8:cvrN/A:
  dmi.product.name: Vostro1310
  dmi.product.version: Null
  dmi.sys.vendor: Dell Inc.

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