Thread: Ubuntu 64bit sees only 3GB of RAM out from 4GB

hi!

i've installed 2x2gb of ram laptop acer 5930g.
@ bios post shows 4094mb:



in ubuntu these values:

code:

$ free -m              total       used       free     shared    buffers     cached mem:          3013       2936         76          0         70       1702 -/+ buffers/cache:       1163       1849 swap:         9536          0       9536

code:

$ free -g              total       used       free     shared    buffers     cached mem:             2          2          0          0          0          1 -/+ buffers/cache:          1          1 swap:            9          0          9

first - free -g shows , why 2?
second - why shows 3013 , not 4094?

lspci output:

code:

00:00.0 host bridge: intel corporation mobile 4 series chipset memory controller hub (rev 07) 00:01.0 pci bridge: intel corporation mobile 4 series chipset pci express graphics port (rev 07) 00:1a.0 usb controller: intel corporation 82801i (ich9 family) usb uhci controller #4 (rev 03) 00:1a.1 usb controller: intel corporation 82801i (ich9 family) usb uhci controller #5 (rev 03) 00:1a.2 usb controller: intel corporation 82801i (ich9 family) usb uhci controller #6 (rev 03) 00:1a.7 usb controller: intel corporation 82801i (ich9 family) usb2 ehci controller #2 (rev 03) 00:1b.0 audio device: intel corporation 82801i (ich9 family) hd audio controller (rev 03) 00:1c.0 pci bridge: intel corporation 82801i (ich9 family) pci express port 1 (rev 03) 00:1c.1 pci bridge: intel corporation 82801i (ich9 family) pci express port 2 (rev 03) 00:1c.2 pci bridge: intel corporation 82801i (ich9 family) pci express port 3 (rev 03) 00:1c.3 pci bridge: intel corporation 82801i (ich9 family) pci express port 4 (rev 03) 00:1c.4 pci bridge: intel corporation 82801i (ich9 family) pci express port 5 (rev 03) 00:1d.0 usb controller: intel corporation 82801i (ich9 family) usb uhci controller #1 (rev 03) 00:1d.1 usb controller: intel corporation 82801i (ich9 family) usb uhci controller #2 (rev 03) 00:1d.2 usb controller: intel corporation 82801i (ich9 family) usb uhci controller #3 (rev 03) 00:1d.7 usb controller: intel corporation 82801i (ich9 family) usb2 ehci controller #1 (rev 03) 00:1e.0 pci bridge: intel corporation 82801 mobile pci bridge (rev 93) 00:1f.0 isa bridge: intel corporation ich9m lpc interface controller (rev 03) 00:1f.2 sata controller: intel corporation ich9m/m-e sata ahci controller (rev 03) 00:1f.3 smbus: intel corporation 82801i (ich9 family) smbus controller (rev 03) 01:00.0 vga compatible controller: nvidia corporation g96 [geforce 9600m gt] (rev a1) 02:00.0 ethernet controller: marvell technology group ltd. 88e8071 pci-e gigabit ethernet controller (rev 16) 03:00.0 network controller: intel corporation wifi link 5100

system is:

code:

$ uname -a linux alpha 3.0.0-16-server #29-ubuntu smp tue feb 14 13:08:12 utc 2012 x86_64 x86_64 x86_64 gnu/linux

upd

also, memtest sees 3067mb:




how can 1gb back?

i know limitation of motherboards not make full 4gb available system.

don't know whether our problem.

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