/bin/echo 0 > /sys/class/backlight/intel_backlight/brightness

made the screen completely dark, but the Fn keys did not work. I needed
to type a

echo 4000 > /sys/class/backlight/intel_backlight/brightness

to be able to see the screen again.

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https://bugs.launchpad.net/bugs/1218547

Title:
  Clevo W350ST brightness keys don't work on Kubuntu

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