Systems that feature switch able graphics, require the usage of a special driver that lets you take advantage of this technology. That driver is completely customized and only provided by your Original Equipment Manufacturer or system manufacturer.
In this case, if you are having issues using those particular drivers, you should contact your Original Equipment Manufacturer directly for assistance on your problem.
That doesn't work.
Lenovo's driver is nothing but an generic Intel Driver, except a little outdated.
I've contacted Lenovo's support, and it's not only me who haves this problem:
Let's see if we can work this out...