[Bug 297583] HP Pavilion x360 brightness hotkeys do not work unless QWIK=1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297583

--- Comment #1 from Miguel Pérez Regueiro <[email protected]> ---
Created attachment 274145
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=274145&action=edit
Add acpi_hp_brightness(4) support for HP Pavilion x360 brightness hotkeys

Attached a patch adding acpi_hp_brightness, based on current FreeBSD main.

I also verified that setting QWIK=1 alone, with acpi_video loaded, is not
sufficient; the brightness keys still do not work without handling the DD02
notifications directly.

The module built from this patch was tested on the affected hardware: loading
it enables the keys, and unloading it disables them.

Tested with GENERIC, NOEVDEV, and LINT builds using -Werror; checkstyle9.pl and
mandoc -T lint also pass.

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