Ubuntu 18.04 not recognizing full RAM

[jyeti]

I recently installed Ubuntu 18.04 on a laptop and have noticed that upon opening Settings and going to Details, it only shows as having 5.8 GiB instead of 8. lshw -class memory shows the full 8 GiB, but free, top and System Monitor all recognize the smaller amount.

[TheFu]

Just a thought, could the onboard GPU take it?

[jyeti]

Upon running lspci -v, the integrated graphics card is shown to only be using 256MB of RAM.

[TheFu]

Sometimes there is a misinterpretation of the output. Any chance of posting the actual commands used AND the output? Perhaps someone else would read it differently.

[jyeti]

Command: lspci
Result:

00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15d0
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 15d1
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3
00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15db
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15dc
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e8
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e9
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ea
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15eb
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ec
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ed
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ee
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ef
01:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
02:00.0 Non-Volatile memory controller: Sandisk Corp Device 5003 (rev 01)
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso (rev c2)
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 15de
03:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 15df
03:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e0
03:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e1
03:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Device 15e2
03:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Device 15e3
03:00.7 Non-VGA unclassified device: Advanced Micro Devices, Inc. [AMD] Device 15e6
04:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 61)

Command: lspci -v -s 03:00.0
Result:

03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso (rev c2) (prog-if 00 [VGA controller])
    Subsystem: ASUSTeK Computer Inc. Device 1821
    Flags: bus master, fast devsel, latency 0, IRQ 255
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Memory at f0000000 (64-bit, prefetchable) [size=2M]
    I/O ports at f000 [disabled] [size=256]
    Memory at fe700000 (32-bit, non-prefetchable) [size=512K]
    Capabilities: <access denied>

[QIII]

Would you please show the actual commends and results of

free

and

top

and

lshw -class memory

It is always best to show all commands and their outputs when seeking support.

[jyeti]

Command: free
Result:

              total        used        free      shared  buff/cache   available
Mem:        6112076     5395684      334012      189200      382380      303900
Swap:       7812092      401152     7410940

The applicable part of the output of top:

KiB Mem :  6112076 total,   266932 free,  5406216 used,   438928 buff/cache
KiB Swap:  7812092 total,  7410940 free,   401152 used.   275512 avail Mem

Command: sudo lshw -class memory
Result:

  *-firmware                
       description: BIOS
       vendor: American Megatrends Inc.
       physical id: 0
       version: X512DA.302
       date: 03/08/2019
       size: 64KiB
       capacity: 8128KiB
       capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification uefi
  *-memory
       description: System Memory
       physical id: a
       slot: System board or motherboard
       size: 8GiB
     *-bank:0
          description: SODIMM DDR4 Synchronous Unbuffered (Unregistered) 2400 MHz (0.4 ns)
          product: M471A5244CB0-CRC
          vendor: Samsung
          physical id: 0
          serial: 00000000
          slot: DIMM 0
          size: 4GiB
          width: 64 bits
          clock: 2400MHz (0.4ns)
     *-bank:1
          description: SODIMM DDR4 Synchronous Unbuffered (Unregistered) 2400 MHz (0.4 ns)
          product: M471A5244CB0-CRC
          vendor: Samsung
          physical id: 1
          serial: 98CF3A3A
          slot: DIMM 0
          size: 4GiB
          width: 64 bits
          clock: 2400MHz (0.4ns)
  *-cache:0
       description: L1 cache
       physical id: c
       slot: L1 - Cache
       size: 384KiB
       capacity: 384KiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=1
  *-cache:1
       description: L2 cache
       physical id: d
       slot: L2 - Cache
       size: 2MiB
       capacity: 2MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=2
  *-cache:2
       description: L3 cache
       physical id: e
       slot: L3 - Cache
       size: 4MiB
       capacity: 4MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=3

[QIII]

Is this a recent observation that was not the case some time ago?

How much memory is indicated by your BIOS?

[jyeti]

The computer was purchased very recently and Ubuntu was installed on it immediately, and this has been the case for the entirety of the time since then.

[jyeti]

Oh, and the BIOS reports 8GB of RAM.