CPU speed scaling restored by removing: cpufreqd
Actually user space scaling programs influence intel_pstate clock scaling 
method.
Recommended to remove:
sudo apt-get remove powernowd cpudyn cpufreqd powersaved speedfreqd 


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1794254

Title:
  Dell Precision 5520 in Battery mode stopped Low Power modes. No CPU
  speed stepping.

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