One more thing respectively to my previous comment:

$ acpi_listen 
# single brightness down button pressed (Fn+F2)
video DD02 00000087 00000000
video DD02 00000087 00000000
# single brightness up button pressed (Fn+F3)
video DD02 00000086 00000000
video DD02 00000086 00000000

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https://bugs.launchpad.net/bugs/207473

Title:
  Screen brightness double level changes on Dell laptops

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