Arch64, still only 3 GB RAM

I own a Fujitsu Siemens Amilo PI 3540 (which has 4 GB RAM installed). I have Arch64, but the memory available is only 3 GB.
$ free -mt
total used free shared buffers cached
Mem: 3012 252 2759 0 3 52
-/+ buffers/cache: 196 2815
Swap: 0 0 0
Total: 3012 252 2759
Someone told me that, it's because the graphic card has shared memory and it uses the 1 GB of RAM. But a few months ago, I installed ubuntu with the ubuntu-server kernel (with PAE enabled) and then I had the 4 GB of RAM.
Can someone help me?

After some research (http://forum.ts.fujitsu.com/forum/viewt … 90&t=39045), I found that Fujitsu Siemens support claims that:
FujitsuSiemens laptops aren't meant to run 64 bit operating systems
Can you believe that?
Anyway I managed to get all the RAM, booting with the parameter
acpi=off
But this disables all power saving and the ability to access thermal data, battery information. And that's not the worst thing, now my system it's rebooting randomly.
Then I found that my Realtek LAN card it's the culprit, because it's using Power Management version 7, which apparently is not supported by the kernel. http://ubuntuforums.org/archive/index.php/t-977074.html
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
Subsystem: Fujitsu Technology Solutions Device 1137
Flags: bus master, fast devsel, latency 0, IRQ 29
I/O ports at 5000 [size=256]
Memory at f6000000 (64-bit, prefetchable) [size=4K]
Memory at f4000000 (64-bit, prefetchable) [size=64K]
[virtual] Expansion ROM at f4010000 [disabled] [size=64K]
Capabilities: [40] Power Management version 7
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [ac] MSI-X: Enable- Count=2 Masked-
Capabilities: [cc] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel <?>
Capabilities: [160] Device Serial Number 5b-01-00-00-ff-ff-00-00
Kernel driver in use: r8169
Kernel modules: r8169
Conclusion: Don't buy FujitsuSiemens laptops!
PS: I'm still stuck with 3 GB of RAM.

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