Enabling volume Fn-contols on the HP 15-0bxx laptop

From: Anton Shepelev <anton.txt_at_gmail.com>
Date: Thu, 04 Jul 2024 22:19:28 UTC
Now that I have enabled[1] the Fn-brighness controls on my
HP 15-0bxx, the next step is to enable the Fn-volume
controls.  Unlike brightness, I do not see anything in
/var/run/devd.pipe when pressing pressing those keys, and
there no is acpi_sound driver, and acpi_hp provides no sound
events or controls.  Can you help?
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1. https://lists.freebsd.org/archives/freebsd-stable/2024-July/002262.html