@PHLin
This should be the infamous xHCI incompatibility issue.
Can you try the following command as root and verify if it can fix it?
  /usr/bin/setpci -s 00:14 d0.w=0x01db

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Changed in: hwe-next
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1381906

Title:
  [Dell Latitude E5550] Atheros Bluetooth [0cf3:e005] gone after suspend

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