https://bugzilla.kernel.org/show_bug.cgi?id=199983

            Bug ID: 199983
           Summary: Error message on boot about data types
           Product: ACPI
           Version: 2.5
    Kernel Version: 4.17.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Config-Tables
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Since many kernel version's an error is logged on every boot.
But the system looks running fine.

message:
ACPI Error: Needed type [Reference], found [Integer]         (ptrval)
(20180313/exresop-69)
ACPI Error: AE_AML_OPERAND_TYPE, While resolving operands for [OpcodeName
unavailable] (20180313/dswexec-427)
ACPI Error: Method parse/execution failed \_PR.CPU0._PDC, AE_AML_OPERAND_TYPE
(20180313/psparse-516)

System: Lenovo T440p firmware: 2.49

As I found, that the error will happens on many Lenovo devices.

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