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[Federico Leoni <effelle@xxxxxxxxx>]

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

** Summary changed:

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

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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.

  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/dell_backlight
  1
  7
  1

  If I increase the backlight the files are correctly updated:
  /sys/class/backlight/dell_backlight
  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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