[Bug 227869] Backlight brightness not working on Lenovo B570e

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227869

            Bug ID: 227869
           Summary: Backlight brightness not working on Lenovo B570e
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: mike.d.ft402 at gmail.com

Created attachment 192927
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192927&action=edit
Verbose boot dmesg.

I'm aware that to control backlight you have to use graphics/intel-backlight
(is there any chance to see this exposed to sysctl in the future without
needing this kludge?) -- and it works if I bind it to some window manager keys.

However, I can not use the brightness keys via window manager nor devd, because
they generate no events at all. I have tried loading different acpi_* kernel
modules, and none of them work.

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