Possible bug in acpi_video(4)

[MrPhyber]

Hello everyone,
my laptop is an Acer Swift SF315-41 with an AMD Ryzen 2500U.
I'm on FreeBSD 12.1-RELEASE-p5 with drm-fbsd12-kmod (amdgpu).
Everything works on this machine except for the hardware brightness controls.
On OpenBSD and Linux they work like a charm, and so I think that there is a
problem in acpi_video(4). I will attach dmesg and acpidump. Whenever I
try to use the hardware brightness switches, this pops up on
the system messages: "can't evaluate \_SB_.PCI0.GP17.VGA_.LCD_._BQC - AE_NOT_FOUND". As you will see, FreeBSD sees acpi_video0 only, and this is
always inactive (sysctl: hw.acpi.video.lcd0.active = 0), but OpenBSD sees acpi_video0, acpi_video1, and others with VGA. Don't know what's the
matter here, any suggestions?
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