[Bug 207999] Screen goes black when loaded i915kms

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207999

            Bug ID: 207999
           Summary: Screen goes black when loaded i915kms
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: johannes at brilliantservice.co.jp
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 168187
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168187&action=edit
dmesg

Hardware
2012 Macbook Air (Sandybridge)

Brightness is set to 0 when loading i915kms from console with kldload.
Blindly (or via ssh) typing intel_backlight 80 restores brightness.

Setting hw.acpi.video.lcd0.fullpower = some value in loader.conf does not help.

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