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[iram <1373880@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  Function backlight keys work both when plugged/unplugged.
  AC adapter seems correctly detected (battery icon displays when I unplug)
  I tried with out success:
  GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor"
  and also
  GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux"
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity-control-center 14.04.3+14.04.20140604-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Sep 25 13:14:25 2014
  InstallationDate: Installed on 2014-07-17 (69 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: unity-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)
  usr_lib_unity-control-center:
   activity-log-manager 0.9.7-0ubuntu14
   deja-dup             30.0-0ubuntu4
  
  Additional info:
  Trying to find on my own, I discovered that the luminosity slider in unity-control-center Luminosity and Lock applet is ineffective, either actuated with mouse and keyboard left/right arrows. The slider moves, but luminosity doesn't follow it.
- I also noticed that the luminosity setting, when set with the Fn Keys, is recorded without control of the current power supply mode, which allows to store a lower setting when on AC than it is recorded when on DC.... which was the reason of my symptom. 
- Maybe a simple change in the window text would make users aware of what they are actually setting: "Luminosity for current ([AC|Battery]) mode"... without preventing them to experiment what was my issue, for any reason (test or any strange reason) they would like it.
+ I also noticed that the luminosity setting, when set with the Fn Keys (which make the slider to move), is recorded without control of the current power supply mode, which allows to store a lower setting when on AC than it is recorded when on DC.... which was the reason of my symptom.
+ Maybe a simple change in the window text would make users aware of what they are actually setting: "Luminosity for current ([AC|Battery]) mode"... without preventing them to experiment what was my issue, for any reason (test or any strange reason) they would like it. As I see the window is able to monitor and adapt its look to Fn keys events, it would be nice if it could also monitor and adapt the text above to power supply source (not only when the window opens, also when the power supply changes when the window is yet opened).

** Summary changed:

- Dell Studio1537 backlight goes to max when I unplug the AC adapter, then dims down when I replug
+ Backlight goes to max when I unplug the AC adapter, then dims down when I replug

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https://bugs.launchpad.net/bugs/1373880

Title:
  Backlight goes to max when I unplug the AC adapter, then dims down
  when I replug

Status in “unity-control-center” package in Ubuntu:
  New

Bug description:
  Function backlight keys work both when plugged/unplugged.
  AC adapter seems correctly detected (battery icon displays when I unplug)
  I tried with out success:
  GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor"
  and also
  GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux"

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity-control-center 14.04.3+14.04.20140604-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Sep 25 13:14:25 2014
  InstallationDate: Installed on 2014-07-17 (69 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: unity-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)
  usr_lib_unity-control-center:
   activity-log-manager 0.9.7-0ubuntu14
   deja-dup             30.0-0ubuntu4

  Additional info:
  Trying to find on my own, I discovered that the luminosity slider in unity-control-center Luminosity and Lock applet is ineffective, either actuated with mouse and keyboard left/right arrows. The slider moves, but luminosity doesn't follow it.
  I also noticed that the luminosity setting, when set with the Fn Keys (which make the slider to move), is recorded without control of the current power supply mode, which allows to store a lower setting when on AC than it is recorded when on DC.... which was the reason of my symptom.
  Maybe a simple change in the window text would make users aware of what they are actually setting: "Luminosity for current ([AC|Battery]) mode"... without preventing them to experiment what was my issue, for any reason (test or any strange reason) they would like it. As I see the window is able to monitor and adapt its look to Fn keys events, it would be nice if it could also monitor and adapt the text above to power supply source (not only when the window opens, also when the power supply changes when the window is yet opened).

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