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

 

Shriramana Sharma, could you please confirm this issue exists with the
latest development release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains,
could you please run the following command in the development release
from a Terminal (Applications->Accessories->Terminal), as it will
automatically gather and attach updated debug information to this
report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available (not the daily folder, but the one at the top) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue.Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.13-rc4

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your
understanding.

** Package changed: xserver-xorg-video-intel (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: New => 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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