I'll give you a more specific example, going to theverge.com and playing one of their videos in Chrome, will cause OSX Yosemite to switch from integrated to dis

I'll give you a more specific example, going to theverge.com and playing one of their videos in Chrome, will cause OSX Yosemite to switch from integrated to discrete graphics. That is typically enough to crash the whole system, allowing you to only move your mouse around.