I wonder if people are trying to tell me something…?

WMI: Latest version (v7) was published on the ACPI mailing lists (I finally figured out my problems). This work has been ported to acer_acpi already (and not a moment too soon, since the Aspire 7520 has multiple PNP0C14 devices).

acer-wmi: Initial RFC (request for comment aka first try, please review) has been posted to the ACPI mailing list. For WMID users, they will see no change. For AMW0 v1 users, the Aspire 5020 EC quirks are enabled by default (since all such laptops reported so far have the same quirk). The biggest change for is AMW0 v2 users, who have been switched over to the WMID methods.

I can’t do this in acer_acpi as I suspect, based on earlier reports, that there may be some upstream ACPI bugs we need to flush out to get this working properly, and I can’t backport ACPI bugfixes into acer_acpi.