Comment # 3 on bug 100395 from Andy Furniss

Created attachment 130499 [details]
dmesg

dmesg attached, plus a link to an external video of what it looks like.

As seen it's also visible when playing a vid, mpv is using opengl for output.

https://drive.google.com/file/d/0BxP5-S1t9VEEak90Tk9wM2dUVlU/view?usp=sharing