In DSDT, _PCL is as below:

            Method (_PCL, 0, NotSerialized)  // _PCL: Power Consumer List
            {
                Return (_SB)
            }

However, ACPI defines _PCL  as

10.3.2 _PCL (Power Consumer List)
This object evaluates to a list of pointers, each pointing to a device or a bus 
powered by the power source device. Pointing to a bus indicates that all 
devices under the bus are powered by the power source device.

Arguments:
  None
Return Value:
  A variable-length Package containing a list of References to devices or buses

Therefore, _PCL should be refined to

            Method (_PCL, 0, NotSerialized)  // _PCL: Power Consumer List
            {
                Return (Package(_SB))
            }

** Changed in: fwts (Ubuntu)
     Assignee: Ivan Hu (ivan.hu) => Alex Hung (alexhung)

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https://bugs.launchpad.net/bugs/1305624

Title:
  [Lenovo B470e] method: detecting type errors

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