maybe prior bug

intel(0): Using Kernel Mode Setting driver: i915_bpo, version 1.6.0 20160214


ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.4.0-10-generic #25-Ubuntu SMP Wed Mar 2 14:55:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

ubuntu@ubuntu:~$ compiz --version
Compiz 0.9.12.2

cat /var/log/Xorg.0.log | grep i915
	915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
[    16.378] (II) intel(0): Using Kernel Mode Setting driver: i915_bpo, version 1.6.0 20160214

ubuntu@ubuntu:~$ dmesg | grep i915
[    5.454398] [drm] Finished loading i915/skl_dmc_ver1.bin (v1.26)
[    5.486080] [drm] Initialized i915_bpo 1.6.0 20160214 for 0000:00:02.0 on minor 0
[    7.316377] i915_bpo 0000:00:02.0: fb0: inteldrmfb frame buffer device
[   14.169263] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915_bpo])