我有：
操作系统：Ubuntu 21.04 KDE Plasma 版本：5.21.4 KDE 框架版本：5.80.0 Qt 版本：5.15.2 内核版本：5.11.0-37-generic 操作系统类型：64 位 图形平台：X11 处理器：4 × Intel® Pentium® CPU 4415U @ 2.30GHz 内存：3.6 GiB RAM 图形处理器：Mesa Intel® HD Graphics 610
我的联想笔记本电脑有 8GB 的额外 RAM，它们在升级之前就被检测到并且可以正常工作。
sudo lshw -C 内存
description: BIOS
vendor: LENOVO
physical id: 0
version: 4WCN40WW
date: 04/13/2018
size: 128KiB
capacity: 6080KiB
capabilities: pci upgrade shadowing cdboot bootselect edd int13floppynec int13floppytoshiba int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int9keyboard int10video acpi usb biosbootspecification uefi
*-cache:0
description: L1 cache
physical id: 5
slot: L1 Cache
size: 128KiB
capacity: 128KiB
capabilities: synchronous internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: 6
slot: L2 Cache
size: 512KiB
capacity: 512KiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: 7
slot: L3 Cache
size: 2MiB
capacity: 2MiB
capabilities: synchronous internal write-back unified
configuration: level=3
*-memory
description: System Memory
physical id: 24
slot: System board or motherboard
size: 4GiB
*-bank:0
description: SODIMM DDR4 Synchronous Unbuffered (Unregistered) 2133 MHz (0.5 ns)
product: M471A5244CB0-CRC
vendor: Samsung
physical id: 0
serial: 00000000
slot: ChannelA-DIMM0
size: 4GiB
width: 64 bits
clock: 2133MHz (0.5ns)
*-bank:1
description: [empty]
physical id: 1
slot: ChannelB-DIMM0
*-memory UNCLAIMED
description: Memory controller
product: Sunrise Point-LP PMC
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
version: 21
width: 32 bits
clock: 33MHz (30.3ns)
capabilities: bus_master
configuration: latency=0
resources: memory:a1324000-a1327fff
sudo dmidecode -t 内存
# dmidecode 3.3
Getting SMBIOS data from sysfs.
SMBIOS 3.0 present.
Handle 0x0024, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 32 GB
Error Information Handle: No Error
Number Of Devices: 2
Handle 0x0025, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x0024
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: 4 GB
Form Factor: SODIMM
Set: None
Locator: ChannelA-DIMM0
Bank Locator: BANK 0
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 2133 MT/s
Manufacturer: Samsung
Serial Number: 00000000
Asset Tag: 9876543210
Part Number: M471A5244CB0-CRC
Rank: 1
Configured Memory Speed: 2133 MT/s
Minimum Voltage: 1.5 V
Maximum Voltage: 1.5 V
Configured Voltage: 1.2 V
Handle 0x0026, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x0024
Error Information Handle: No Error
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: Unknown
Set: None
Locator: ChannelB-DIMM0
Bank Locator: BANK 2
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Memory Speed: Unknown
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: Unknown
sudo swapon-显示
NAME TYPE SIZE USED PRIO
/swapfile file 15G 2.8M -2
答案1
来自评论...
将 SODIMMS 重新安装到插槽中。有一个没看到。我敢打赌 BIOS 也看不到它。
更新＃1：
重新安装 SODIMMS 解决了该问题。