https://bugs.freedesktop.org/show_bug.cgi?id=97260
--- Comment #15 from nadro-linux@wp.pl --- I also noticed a big performance regression since kernel v4.7rc1. With kernel 4.6 all works fine. I have Radeon R9 380 2GB (Sapphire ITX Compact). I'll try to build a custom kernel without "support for DRM_MODE_PAGE_FLIP_ASYNC" commit and check if performance will be ok.