[Bug 207889] Significant increase in Sandy Bridge laptop power consumption after Linux 3.8 i915 update

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207889

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Mon Mar 21 00:59:30 UTC 2016
New revision: 297128
URL: https://svnweb.freebsd.org/changeset/base/297128

Log:
  i915: disable GEN6_MBCTL write in gen6_init_clock_gating

  This write came from Linux commit b4ae3f22d238 which has been implicated
  in Sandy Bridge power consumption issues (albeit under different
  conditions on Linux). Disabling it restores normal power consumption on
  my Sandy Bridge laptop (Thinkpad X220).

  PR:           207889
  Reviewed by:  cem, dumbbell
  Sponsored by: The FreeBSD Foundation
  Differential Revision:        https://reviews.freebsd.org/D5665

Changes:
  head/sys/dev/drm2/i915/intel_pm.c

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