Bug ID: 210751
           Summary: "Could not resolve symbol [^^^GFX0.AFN2]" errors on
                    Lenovo Ideapad 330s
           Product: ACPI
           Version: 2.5
    Kernel Version: 5.9.14
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: BIOS
        Regression: No

Created attachment 294197

When the Lenovo Ideapad 330s is running on battery, the following error message
is printed in the kernel log every second or so.

[    0.967136] ACPI BIOS Error (bug): Could not resolve symbol [^^^GFX0.AFN2],
AE_NOT_FOUND (20200717/psargs-330)
[    0.967173] ACPI Error: Aborting method \_SB.PCI0.LPCB.H_EC._QC9 due to
previous error (AE_NOT_FOUND) (20200717/psparse-529)

This does not happen when the AC adapter is plugged in, and the laptop does not
have other symptoms.

Does not seem specific to a Linux kernel version.

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