the output is intel_backlight
It appers, that ist fixed. I booted it up on the machine to run command and the 
slider is there. Did not change any settings. just did apt autoremove before 
last shutdown. I guess it changed the default jernel executable to the newest

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https://bugs.launchpad.net/bugs/1829256

Title:
  [Dell Vostro 5568] Cannot find display brightness settings anywhere

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