[Bug 190186] [patch] i915 driver: enable opregion handling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=190186

--- Comment #8 from Henry Hu <henry.hu.sh at gmail.com> ---
(In reply to Adrian Chadd from comment #7)
> root at sabrina:/home/adrian # acpi_call -p "\VIGD"
> 1
> root at sabrina:/home/adrian # acpi_call -p "\_SB.PCI0.VID.DRDY"
> 1
> 
> 
> and yes:
> 
> acpi_call -p "\_SB.PCI0.VID.LCD0._BCM" -i <x>
> 
> works, but unpredictably.
> 
> I can't go 5, then 99. I have to go 5, 10, 20, 30, 40, .. 99 or going
> straight to 99 doesn't work.

That's strange. Setting hw.acpi.video.lcd0.brightness should be the same as
calling _BCM.
Have you tried calling _BCM without calling VBRC(14) first?

For the brightness levels, only the ones in hw.acpi.video.lcd0.levels are
accepted, but I still have no idea why you can't change the brightness level
directly.

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