Hi, I might have this bug as well on i3wm. I believe it's the same, flickering
when mouse movement occurs. However it's not flickering, it's more like it's
locking the framebuffer and preventing any draws. Try running glxgears and
moving your cursor in circles. I can get the gear to stop turning completely if
I move my mouse quickly enough. Do we have the same bug? 

Vega 64