Screen brightness is not adjustable on Lenovo P51 laptops

Solution Verified - Updated -

Issue

In standalone mode (e.g. not docked), the screen contrast is not adjustable using Fn + F5 or Fn + F6 or using the brightness control available on the menu bar.

Environment

  • Red Hat Enterprise Linux 7.5
  • Gnome 3.22.2
  • Lenovo Thinkpad P51

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