Não é possível ver a RAM completa de 8GB no Ubuntu 16.04 LTS x64

Question

Comprei recentemente o novo sistema Lenovo G41-35 e instalei o Ubuntu 16.04 LTS nele.

Meu ram tem 8 GB, mas devido a algum motivo, ele mostra apenas 3.3 GiB nos detalhes.

Como posso usar o RAM de 8GB no meu sistema Ubuntu.

Veja informações completas:

Abaixoestãoalgunscomandoscomsaída:

free-m

Saída:

totalusedfreesharedbuff/cacheavailableMem:335410807575115151922Swap:24412024412

sudolshw-classmemory

Saída:

*-firmwaredescription:BIOSvendor:Lenovophysicalid:0version:C3CN54WWdate:11/18/2015size:128KiBcapacity:8128KiBcapabilities:pciupgradeshadowingcdbootbootselecteddint5printscreenint9keyboardint14serialint17printerint10videopc98acpiusbbiosbootspecificationnetboot*-cache:0description:L1cachephysicalid:28slot:L1Cachesize:256KiBcapacity:256KiBclock:1GHz(1.0ns)capabilities:pipeline-burstinternalwrite-backunifiedconfiguration:level=1*-cache:1description:L2cachephysicalid:29slot:L2Cachesize:2MiBcapacity:2MiBclock:1GHz(1.0ns)capabilities:pipeline-burstinternalwrite-backunifiedconfiguration:level=2*-memorydescription:SystemMemoryphysicalid:2aslot:Systemboardormotherboardsize:8GiB*-bank:0description:SODIMMDDR3Synchronous1333MHz(0.8ns)product:9905417-075.A00Gvendor:Kingstonphysicalid:0serial:2C2602BFslot:DIMM0size:4GiBwidth:64bitsclock:1333MHz(0.8ns)*-bank:1description:SODIMMDDR3Synchronous1600MHz(0.6ns)product:EBJ40UG8EFU0-GN-Fvendor:Elpidaphysicalid:1serial:95CB18FDslot:DIMM1size:4GiBwidth:64bitsclock:1600MHz(0.6ns)

uname-a

Saída:

Linuxmuhammad-mohsin4.8.0-36-generic#36~16.04.1-UbuntuSMPSunFeb509:39:57UTC2017x86_64x86_64x86_64GNU/Linux

uname-m

Saída:

x86_64

sudolshw|grep-m1-A25"*-memory"

Saída:

*-memory
      description: System Memory
      physical id: 2a
      slot: System board or motherboard
      size: 8GiB
    *-bank:0
         description: SODIMM DDR3 Synchronous 1333 MHz (0.8 ns)
         product: 9905417-075.A00G
         vendor: Kingston
         physical id: 0
         serial: 2C2602BF
         slot: DIMM 0
         size: 4GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:1
         description: SODIMM DDR3 Synchronous 1600 MHz (0.6 ns)
         product: EBJ40UG8EFU0-GN-F
         vendor: Elpida
         physical id: 1
         serial: 95CB18FD
         slot: DIMM 1
         size: 4GiB
         width: 64 bits
         clock: 1600MHz (0.6ns)
 *-pci:0

sudo lshw -short -C memory

Saída:

H/W path               Device           Class          Description
==================================================================
/0/0                                    memory         128KiB BIOS
/0/27/28                                memory         256KiB L1 cache
/0/27/29                                memory         2MiB L2 cache
/0/2a                                   memory         8GiB System Memory
/0/2a/0                                 memory         4GiB SODIMM DDR3 Synchronous 1333 MHz (0.8 ns)
/0/2a/1                                 memory         4GiB SODIMM DDR3 Synchronous 1600 MHz (0.6 ns)