See 
http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=K04R3&fileId=3450461628&osCode=W764&productCode=latitude-e6540-laptop&languageCode=EN&categoryId=BI
The latest BIOS A14 from April 2015 has this single note:
"- Fixed CPU may be limited at low speed after resume from standby"

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https://bugs.launchpad.net/bugs/1260112

Title:
  [Dell Latitude E6540] CPU stuck on minimum frequency after resume from
  suspend and unplugged

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