[Bug 240778] lacking support for Lenovo Thinkpad T490

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240778

            Bug ID: 240778
           Summary: lacking support for Lenovo Thinkpad T490
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: uqs at FreeBSD.org

Hi

misc/229120 added some tweaks for newer models, but didn't do much for my T490.

As requested, I'm adding an acpidump -dt.

Not working:
- neither acpi_ibm nor acpi_video attach so display brightness can't be changed
- wifi is not working, but there's bug #227044 for that already
- sound isn't working
- evdev support would be nice, but that PR should live somewhere else

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