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It's a firmware bug. ACPI entries not conforming to the ACPI specifications is an extremely common problem.
It happens because Windows has its very own (lax) rules for parsing ACPI tables, and most hardware is only really tested properly against Windows.
Since the problem occurred after an OS upgrade, it would seem that more recent kernels take issue with this particular ACPI error. Short of performing a BIOS upgrade, assuming one is available for your system, there's nothing much you can do to resolve the issue.
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