After I've been trying for two days to install Win7 64bit, and tried the hotline of Lenovo I found the fault yourself.
The device is not the graphics card installed that is specified!
When you install the drivers from the Lenovo M230 is the R5 installed. This is not installed in the device.
The correct driver for the AMD homepage Drivers / Notebook / HD Series / HD8xxxx
invite. This is the correct driver.
I hope I can help a lot. Lenovo himself knows nothing about it. The device is good, support for Lenovo deficient.