The same problem on MacBook Air 2014 in the transition to the standby mode. 
After that set the brightness below 90% is not possible, the screen goes off 
completely. I think the problem in the module wl.
WARNING: CPU: 3 PID: 86 at drivers/gpu/drm/i915/intel_pm.c:6585 
intel_display_power_put+0x15c/0x170 [i915]() [i915]

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https://bugs.launchpad.net/bugs/1275794

Title:
  Lenovo T440s freezes when connected to docking station

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