AMT has two types of remote console: emulated serial and full graphical. The emulated serial console requires only that the operating system run a console on that serial port, while the graphical environment requires drivers on the OS side.
Sadly this is incorrect. The full-blown graphical capability of AMT is providing a fully functional OS-independent VNC server that can be connected to by any proper VNC client. It is disabled by default and can be configured to require a simple (max. 8 char) VNC password.
Whether your AMT has this capability or not depends on the OEM. This feature is, along with many AMT functions, configurable in the factory. You can even put your AMT-capable motherboard into the manufacturing mode most of the time (it requires physical fiddling).
About graphical capabilities of AMT
Sadly this is incorrect. The full-blown graphical capability of AMT is providing a fully functional OS-independent VNC server that can be connected to by any proper VNC client. It is disabled by default and can be configured to require a simple (max. 8 char) VNC password.
Whether your AMT has this capability or not depends on the OEM. This feature is, along with many AMT functions, configurable in the factory. You can even put your AMT-capable motherboard into the manufacturing mode most of the time (it requires physical fiddling).