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[Launchpad Bug Tracker <1230419@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

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

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https://bugs.launchpad.net/bugs/1230419

Title:
  brightness hotkeys don't work properly in 13.10 on thinkpad x230

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  This is a regression from the behaviour of Kubuntu 13.04, it seems to
  be caused both by the kernel upgrade and the KDE upgrade. When
  changing brightness with the laptop function keys, key presses don't
  correspond to supported brightnesses in the display, and the
  brightness bar is not displayed.

  My laptop is a Thinkpad X230 with an i7-3520M and integrated intel
  graphics.

  On Kubuntu 13.04 with stock packages:
  Screen brightness hotkeys work as expected. Increment/decrement in steps of 10, brightness indicator is displayed by KDE.

  On Kubuntu 13.04 with KDE 4.11 backport packages from the Kubuntu PPA:
  Screen brightness hotkeys still increment/decrement in steps of 10, brightness indicator is not displayed.

  On Kubuntu 13.04 with 3.12 mainline kernel from PPA, and stock KDE packages:
  Screen brightness keys increment/decrement in steps of 1. Needs 10 button presses for display brightness to change.

  On Kubuntu 13.10 daily build *OR* Kubuntu 13.04 with 3.12 mainline kernel and KDE 4.11 backport packages:
  Needs 10 button pressses for display brightness to change, no brightness indicator displayed. There also seems to be desync between brightness in the battery monitor applet, and the actual screen brightness.

  Expected behaviour:
  Same as 13.04 with stock packages.

  Please let me know what other info I can provide.

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