https://bugzilla.kernel.org/show_bug.cgi?id=200723

            Bug ID: 200723
           Summary: Thinkpad T450 acpi errors
           Product: ACPI
           Version: 2.5
    Kernel Version: 4.17.11
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ACPICA-Core
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Details of issue:

Error parsing PCC subspaces from PCCT

ACPI Error: Needed type [Reference], found [Integer] (ptrval)
(20180313/exresop-69)
[ 0.107660] ACPI Error: AE_AML_OPERAND_TYPE, While resolving operands for
[OpcodeName unavailable] (20180313/dswexec-427)
[ 0.107751] ACPI Error: Method parse/execution failed \_PR.CPU0._PDC,
AE_AML_OPERAND_TYPE (20180313/psparse-516)

ACPI Error: AE_AML_PACKAGE_LIMIT, Index (0x000000005) is beyond end of object
(length 0x4) (20180313/exoparg2-396)
[ 34.891858] ACPI Error: Method parse/execution failed \_SB.PCI0.LPC.EC.BFRQ,
AE_AML_PACKAGE_LIMIT (20180313/psparse-516)
[ 34.891869] ACPI Error: Method parse/execution failed \_SB.PCI0.VID.LCD0._BCL,
AE_AML_PACKAGE_LIMIT (20180313/psparse-516)


I tried to get help in this user forum.

https://forum.mxlinux.org/viewtopic.php?f=107&t=45887

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