sudo lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device 21f3
Flags: bus master, fast devsel, latency 0, IRQ 43
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 5000
Expansion ROM at <unassigned> [disabled]
Capabilities:  MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
[ 0.751141] [drm] Initialized drm 1.1.0 20060810
[ 0.984183] [drm] Memory usable by graphics device = 2048M
[ 1.005554] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[ 1.005556] [drm] Driver supports precise vblank timestamp query.
[ 1.268552] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[ 1.374961] fbcon: inteldrmfb (fb0) is primary device
[ 2.187772] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 2.197836] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[ 2.813851] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off
As you can see, IN THEORY the OS should use 2 GB of VRAM, or at least it looks so to me. However, even if running KSP or ETS2, the amount of VRAM never changes and this results in a game crash/OS freeze.
Here's a screenshot when I have KSP running in another workspace (it's basically the same with ETS2):
Rxs23vd.png 460.1 K