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[Charles Baylis <charles.baylis@xxxxxxxxxx>]

I went back to the stock trusty (3.13) kernel, and it works again. It
seems that it doesn't work if I apt-get install linux-generic-lts-utopic

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https://bugs.launchpad.net/bugs/1438754

Title:
  Backlight cannot be adjusted at lock screen

Status in Unity:
  Incomplete
Status in unity package in Ubuntu:
  Incomplete

Bug description:
  
  This affects 14.04 LTS. I haven't tried any more recent versions.

  When the screen is locked, it is not possible to use the Fn+Brightness
  up/down keys.

  If I am using an external monitor, then I turn down the backlight
  brightness to zero. I often use my laptop at the office with an
  external monitor and the backlight turned off.  When I come home and
  resume, the backlight is off and I cannot switch it on to see the
  login prompt.

  Steps to reproduce
  1. Set backlight brightness to off using Fn+brightness down
  2. Lock computer with Super+L
  3. Attempt to increase brightness with Fn+brightness up

  Expected results:
  Backlight switches on, and Lock/login screen becomes visible

  Actual results:
  Backlight remains off and Lock/login screen is not visible

  This is a regression in 14.04 LTS since the 14.04 release. I can't
  remember when this started happening, but it's been at least a few
  weeks.

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