E430 - System shows only 2.5GB RAM, I have 4GB installed.

Hello. 
I have an E430 with Core i5 Ivy Bridge, 4GB RAM, onboard graphics. OS is Ubuntu 14.04 64-bit. No components have been installed or replaced since purchase.
The problem is, system only shows I have 2.5GB RAM total. In BIOS it correctly shows 4096GB RAM installed.
People suggested it might be the graphics allocating the rest of the RAM (which makes sense in a way, since I read at some other places that max. RAM for the graphics is set around ~1.5GB). And they suggested I should look in the BIOS for a setting which would influence this. I found none.
I got some info about the graphics using a command, and it shows:
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
That does not look like allocating 1.5GB RAM to me.
Also there is this:
Kernel driver in use: i915
Is that the right driver? 
Does anyone know whether it is really the GPU allocating way too much RAM? How could I stop it or make the currently-unused RAM available to the system again? Or is there another problem, not linked to GPU?
Thanks.

Free ram isn't the on,y ram that's available to run programs http://support.apple.com/kb/HT1342
BUT.....2gb is the bare minimum for running Lion, you need at least 4gb in reality. Your computer will run better with 4gb.

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