[Bug 209727] Panic in i915kms on power mode change

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209727

            Bug ID: 209727
           Summary: Panic in i915kms on power mode change
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: info at juanmolina.eu
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 170587
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170587&action=edit
Picture of the panic

While testing the freebsd-base-graphics/drm-next-4.6 branch with a Haswell (HD
4400) GPU laptop, changing the power mode (plugging or unplugging the power
cord) leads to instant panic, while with the drm-next-3.9 branch, switching
AC/battery modifies backlight value up and down without issues.

To reproduce:
# kldload drm2 
# sysctl dev.drm.skip_ddb=1 
# kldload i915kms 
[plug / unplug the power cord  (the result is exactly the same)] 

panic: IMPLEMENT ME 
…then the backtrace (attached image).

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