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

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

--- Comment #4 from Henry Hu <henry.hu.sh at gmail.com> ---
(In reply to Adrian Chadd from comment #3)
> So if I then do this:
> 
> # cd /usr/ports/sysutils/acpi_call && make install clean 
> # rehash 
> # kldload acpi_ibm 
> # kldload acpi_call 
> # acpi_call -p '\VBRC' -i 14
> 
> .. then if I use sysctl hw.acpi.video.lcd0.brightness=X, things work fine. I
> can even set it to 99 and it works fine. The buttons don't work fine - they
> only vary the brightness a couple of values around whatever I set it.
> 
> So I wonder what else is problematic with this thing! Any ideas/suggestions?

I don't have \VBRC in my ACPI DSDT. Maybe you can post your DSDT and we can
have a look at it.

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