A bit of a tangent, but what exactly is the problem with GPU acceleration and screens coming back from power-save mode? I'm having a problem with a GL context

A bit of a tangent, but what exactly is the problem with GPU acceleration and screens coming back from power-save mode? I'm having a problem with a GL context not drawing correctly after my monitor wakes up (Windows). I'm not quite sure how to google the problem without getting a bunch of hardware results.