Intel is a really bad chip, I have loads of problems with various software in DirectX and OpenGL views, my Toshiba laptop is a nightmare.
I can't recall which chip mine has but the drivers date back to 2009 and nothing newer, the software I beta test uses a newer version of OpenGL the Intel has problems rendering none power of two textures in openGL views, Google Sketchup flashes between shaded and unshaded if shadows are used
I've not seen the above but mine doesn't hibernate or sleep, its role in life is a render node (no battery and hardwired)
My main PC is NVidia and I can't say I've seen it do the same, but that shuts down the monitor it doesn't sleep either