In rendercheck (https://cgit.freedesktop.org/xorg/app/rendercheck) we have over one thousand test cases were added but because of it the pass rate has also decreased (test failing).
We tested this using the Q1 stack components:
Linux Kernel - 4.4
Mesa - 11.1.2
xf86-video-intel - 2.99.917
Libdrm - 2.4.67
Libva - 1.7.0
vaapi intel-driver - 1.7.0
Cairo - 1.15.2
Xorg Xserver - 1.18.1
Intel-gpu-tools - 1.14
On the following platforms: BDW, BSW, BXT and SKL
If you need more information feel free to ask.
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