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

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

--- Comment #3 from Adrian Chadd <adrian at freebsd.org> ---
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?

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