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PNP devices may represent ACPI-enumerated hardware but do not have a parent type supported by path_id. Consequently, importing path_id fails even when the PNP device exposes a stable ACPI firmware_node. This also prevents later assignments in rules such as the systemd-backlight activation rule from taking effect. Resolve the PNP device's firmware_node and use its ACPI sysname for the path component. This gives PNP-backed devices the same stable identity as their firmware representation. Add a regression test using an RTC device below a PNP parent with an ACPI firmware node.
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