[Bug 208729] [i915kms] backlight on X230 (ivybridge) doesn't come on after resume

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208729

            Bug ID: 208729
           Summary: [i915kms] backlight on X230 (ivybridge) doesn't come
                    on after resume
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: adrian at freebsd.org

hiya,

I have a Lenovo X230 (ivybridge) which works fine on -HEAD now but the
backlight doesn't come on after resume. The laptop itself is fine though.
Brightness controls work fine until suspend/resume. The laptop resumes okay and
I can type reboot, ssh into it, etc fine.

This worked before the big haswell import.

r297693 definitely doesn't work. :(

I'll try some earlier kernels to see if I can pinpoint when things broke.

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