(In reply to vivianhu from comment #1)
> Our schedule is very urgent, so can anyone can help me and point out a way
> to solve it?

Please raise any priority issues with your regular customer support channels.
Otherwise, this bug is just one among many others.

Please ensure you have either i915.preliminary_hw_support=1 module parameter
set or CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT=y kernel config option set.

Please attach dmesg from boot with drm.debug=14 module parameter set,
exhibiting the problem.

Please try drm-intel-nightly branch of http://cgit.freedesktop.org/drm-intel