Debian Hardware :: Graphic Card Intel HD4400 Not Recognized

I'm trying to make things work on my laptop. Almost done, but there is one hardware issue left. I have a Intel HD4400 graphic card. But it seems that it is not recognized. I had an issue loading Gnome3.

Code: Select allGNOME 3 Failed to Load

Unfortunately GNOME 3 failed to start properly and started in the fallback mode.

This most likely means your system (graphics hardware or driver) is not capable of delivering the full GNOME 3 experience

Another thing :
Code: Select all$ grep EE /var/log/Xorg.0.log
[    29.117] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument

Also, if I go in "applications" ->"system tools" -> "Preferences" -> "System settings" and then in "Details, under Graphics I have "Drivers : unknown", "Experience : Fallback".

And as a consequence, I can't use dual-screen. If I plug another sreen, I have an exact copy, not even with a good resolution.

I search on the web for solutions, but I didn't understand much. I don't know what Xorg is, x-window, etc...