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[Bug 1255428] Re: LCD brightness control keys and widget do not work on Intel Graphics on Saucy

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Fri, 14 Feb 2014 06:23:13 -0000
Reply-to: Bug 1255428 <1255428@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Shriramana Sharma, please execute the following in a terminal:
apport-collect 1255428

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1255428

Title:
  LCD brightness control keys and widget do not work on Intel Graphics
  on Saucy

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After upgrading to Saucy, on my Lenovo IdeaPad Z570 with Intel HD
  Graphics 3000, it is no longer possible to control the LCD brightness
  using the hardware brightness control keys. Likewise for the KDE power
  management settings or the battery icon on my Kubuntu Plasma tray. (I
  don't use GNOME/Unity.) Until Raring I did not have this problem.

  There is a workaround available from
  http://askubuntu.com/questions/362894/changing-the-brightness-stopped-
  working-in-13-10-saucy-salamander i.e. doing the following command on
  a terminal:

  echo 150 | sudo tee /sys/class/backlight/intel_backlight/brightness

  where 150 is on the scale of 0 to whatever is given within
  /sys/class/backlight/intel_backlight/max_brightness.

  Based on this I wrote a GUI which however needs to be run using
  sudo/kdesudo/gksudo. I have attached it.

  Bug #1241745 also relates to the same problem on Saucy but apparently relates to an NVidia driver and I was asked to track this as a separate bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1241745/comments/17
  --- 
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  DistroRelease: Ubuntu 13.10
  InstallationDate: Installed on 2013-10-19 (38 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Tags:  saucy
  Uname: Linux 3.11.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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