Comment # 4 on bug 72291 from Thomas Lindroth

I also experience this problem on my HD5770 card. As far as I can remember it
existed back when the UVD code was first released.

The freeze happens when a majority of the video windows is moved to the other
screen. I guess it has something to do with vsync being changed to the other
screen.

I also run git of all relevant packages except the kernel and I use up to date
radeon-ucode.