The combination of a video card and the Intel integrated graphics controller is not supported by the Intel generic graphics drivers from the Intel website, so is possible when the computer recovers from sleep the Intel graphics controller will not come back on because of the drivers you are currently using.
To solve your issue I recommend to use the graphics drivers provided by your computer manufacturer.
Also for more information go to the link below:
I have the exact same problem. I want to use the integrated video to output to my TV when I want to watch full screen video. I found the enable/disable way to fix it for the time being but was hoping there was another fix. I use a high performance video card for video games on my main monitor.
michael - My manufacturer Gigabyte (GA-Z77MX-D3H) is the one that told me to install the intel video driver (Intel HD Graphics 3000). Why isn't this supported? Doesn't see too difficult to just automatically reset the driver when waking from sleep.