Random annoying brightness changes are usually due to the automatic
brightness feature which is enabled on some models of laptop. Please
look in Settings > Power > Power Saving and see what automatic
brightness settings your system has available, and disable them.

** Package changed: xorg (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2150784

Title:
  screen freeze - brightness changing

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