Please try v4.2-rc7 or drm-intel-nightly branch of [1], drop all i915 module parameters (such as i915.enable_rc6 i915.enable_fbc i915.lvds_downclock and i915.semaphores, they are not for regular use), add drm.debug=14, attach dmesg all the way from early boot.
Please try v4.2-rc7 or drm-intel-nightly branch of [1], drop all i915 module parameters (such as i915.enable_rc6 i915.enable_fbc i915.lvds_downclock and i915.semaphores, they are not for regular use), add drm.debug=14, attach dmesg all the way from early boot.
[1] http:// cgit.freedeskto p.org/drm- intel