我的笔记本上有一根 ChannelA-DIMM0 Micron 4 GB RAM 棒。BIOS 和 Windows 10 正确识别我的 RAM 为 4096 MB，但 Ubuntu 仅检测到 3.7 GB。问题可能出在哪里？
free -m
：
total used free shared buff/cache available
Mem: 3726 1181 453 483 2091 1818
Swap: 3139 0 3139
sudo lshw -c memory
：
*-firmware
description: BIOS
vendor: LENOVO
physical id: 0
version: KKCN10WW
date: 04/14/2022
size: 64KiB
capacity: 3MiB
capabilities: pci upgrade shadowing cdboot bootselect edd int9keyboard int14serial int17printer int10video acpi usb zipboot biosbootspecification netboot
*-cache:0
description: L1 cache
physical id: 6
slot: L1 Cache
size: 128KiB
capacity: 128KiB
capabilities: synchronous internal write-back instruction
configuration: level=1
*-cache:1
description: L2 cache
physical id: 7
slot: L2 Cache
size: 4MiB
capacity: 4MiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache
description: L1 cache
physical id: 5
slot: L1 Cache
size: 96KiB
capacity: 96KiB
capabilities: synchronous internal write-back data
configuration: level=1
*-memory
description: System Memory
physical id: 23
slot: System board or motherboard
size: 4GiB
*-bank
description: Row of chips DDR4 Synchronous 2400 MHz (0,4 ns)
vendor: Micron
physical id: 0
serial: 00000000
slot: ChannelA-DIMM0
size: 4GiB
width: 8 bits
clock: 2400MHz (0.4ns)
sudo dmidecode -s bios-version
：
KKCN10WW