Hardware: R7 360, Linux x86_64
Screen: 1680x1050

To reproduce this bug, play the "Weather" video at http://www.bbc.co.uk/weather
using Firefox and Adobe's flash-plugin-11.2.202.643-release.x86_64. Ensure that
"Hardware acceleration" is enabled, and then enter "Full screen" mode.

On my PC, this results in a black screen with a small, blank rectangle in the
top left corner. And then the flash plugin will crash a few minutes later.

This does not happen with either i965 (Broadwell) or r600 (HD6450) hardware.
Nor does it happen with Chromium and
chromium-pepper-flash-23.0.0.162-1.fc24.x86_64 with my R7 360, although
chromium-pepper-flash doesn't appear to use libvdpau_radeonsi.so either.