drm/i915: don't warn if backlight unexpectedly enabled
BIOS or firmware can modify hardware state during suspend/resume, for example on the Toshiba CB35 or Lenovo T400, so log a debug message instead of a warning if the backlight is unexpectedly enabled. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80930 Cc: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Scot Doyle <lkml14@scotdoyle.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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