Ubuntu 20.04 распознает только 8 ГБ ОЗУ из 16 ГБ

UEFI / BIOS полностью распознает RAM.

• CPU: AMD R5 2600
• Материнская плата: Asrock B450 Pro BIOS V. P4.10
• RAM: G Skill Ripjaws V Series 2 x 8 ГБ

sudo dmesg | grep memory
[    0.000000] check: Scanning 1 areas for low memory corruption
[    0.000000] Early memory node ranges
[    0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000fffff]
[    0.000000] PM: Registered nosave memory: [mem 0x09d02000-0x09ffffff]
[    0.000000] PM: Registered nosave memory: [mem 0x0a200000-0x0a20afff]
[    0.000000] PM: Registered nosave memory: [mem 0x0b000000-0x0b01ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xd7717000-0xd7717fff]
[    0.000000] PM: Registered nosave memory: [mem 0xd7727000-0xd7727fff]
[    0.000000] PM: Registered nosave memory: [mem 0xd7c58000-0xd7c98fff]
[    0.000000] PM: Registered nosave memory: [mem 0xda245000-0xda245fff]
[    0.000000] PM: Registered nosave memory: [mem 0xdb19d000-0xdc691fff]
[    0.000000] PM: Registered nosave memory: [mem 0xdc814000-0xdcc27fff]
[    0.000000] PM: Registered nosave memory: [mem 0xdcc28000-0xdd775fff]
[    0.000000] PM: Registered nosave memory: [mem 0xdf000000-0xdfffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xe0000000-0xf7ffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xf8000000-0xfbffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfc000000-0xfcffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfd000000-0xffffffff]
[    0.004707] Freeing SMP alternatives memory: 40K
[    0.363035] Freeing initrd memory: 80116K
[    0.363429] check: Scanning for low memory corruption every 60 seconds
[    0.488275] Freeing unused decrypted memory: 2040K
[    0.488733] Freeing unused kernel image memory: 2712K
[    0.503646] Freeing unused kernel image memory: 2008K
[    0.503898] Freeing unused kernel image memory: 1192K
[    0.612584] [TTM] Zone  kernel: Available graphics memory: 4038424 KiB
[    0.612585] [TTM] Zone   dma32: Available graphics memory: 2097152 KiB
[    0.612599] [drm] radeon: 1024M of VRAM memory ready
[    0.612599] [drm] radeon: 1024M of GTT memory ready.

    sudo lshw -C memory
  *-firmware                
       description: BIOS
       vendor: American Megatrends Inc.
       physical id: 0
       version: P4.10
       date: 03/05/2020
       size: 64KiB
       capacity: 16MiB
       capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi
  *-memory
       description: System Memory
       physical id: e
       slot: System board or motherboard
       size: 16GiB
     *-bank:0
          description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2133 MHz (0.5 ns)
          product: F4-3200C16-8GVKB
          vendor: Unknown
          physical id: 0
          serial: 00000000
          slot: DIMM 0
          size: 8GiB
          width: 64 bits
          clock: 2133MHz (0.5ns)
     *-bank:1
          description: [empty]
          product: Unknown
          vendor: Unknown
          physical id: 1
          serial: Unknown
          slot: DIMM 1
     *-bank:2
          description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2133 MHz (0.5 ns)
          product: F4-3200C16-8GVKB
          vendor: Unknown
          physical id: 2
          serial: 00000000
          slot: DIMM 0
          size: 8GiB
          width: 64 bits
          clock: 2133MHz (0.5ns)
     *-bank:3
          description: [empty]
          product: Unknown
          vendor: Unknown
          physical id: 3
          serial: Unknown
          slot: DIMM 1
  *-cache:0
       description: L1 cache
       physical id: 10
       slot: L1 - Cache
       size: 576KiB
       capacity: 576KiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=1
  *-cache:1
       description: L2 cache
       physical id: 11
       slot: L2 - Cache
       size: 3MiB
       capacity: 3MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=2
  *-cache:2
       description: L3 cache
       physical id: 12
       slot: L3 - Cache
       size: 16MiB
       capacity: 16MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=3

    free -h
              total        used        free      shared  buff/cache   available
Mem:          7.7Gi       2.4Gi       4.6Gi        89Mi       717Mi       4.9Gi
Swap:         2.0Gi          0B       2.0Gi