I have noticed something strange on my Fedora 21 with i915. If I am using something that utilizes vaapi, like VLC for instance, the screen only refreshes on mouse movements. This becomes abundantly clear when I watch the clock on my panel for example, which displays seconds on it. It will sit at the same time and not tick the seconds if I leave the mouse perfectly still. As soon as I move the mouse the clock updates and will continue to update as long as I keep the mouse moving. I am sure you will want more information but I am not sure what to gather. I am using the 3.18.7-200.fc21.x86_64 kernel. Just let me know what other information you need and I will be happy to provide it. Cheers, b.
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