No detecta mi ram en el segundo slot

windows detectaba mis 8gb de ram pero al pasarme a manjaro no me percate que solo detectaba 4gb hasta que por casualidad entre en Htop y note que solo decia que habia disponibles 3.29gb

adjunto la salida del comando inxi -Fxxxza --no-host

System:
  Kernel: 5.8.6-1-MANJARO x86_64 bits: 64 compiler: N/A 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.8-x86_64 
  root=UUID=4744673f-d380-401f-a4d0-c55ad726285b rw quiet apparmor=1 
  security=apparmor resume=UUID=27967dc8-26b6-437d-8f64-eba488911f18 
  udev.log_priority=3 
  Desktop: Xfce 4.14.2 tk: Gtk 3.24.20 info: xfce4-panel wm: xfwm4 
  dm: LightDM 1.30.0 Distro: Manjaro Linux 
Machine:
  Type: Laptop System: TOSHIBA product: Satellite C40D-A v: PSCDSM-005TM1 
  serial: <filter> 
  Mobo: AMD model: Larne serial: <filter> UEFI: Insyde v: 1.20 
  date: 05/31/2013 
CPU:
  Topology: Quad Core model: AMD A6-5200 APU with Radeon HD Graphics 
  bits: 64 type: MCP arch: Jaguar family: 16 (22) model-id: N/A stepping: 1 
  microcode: 700010F L2 cache: 2048 KiB 
  flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 
  bogomips: 15979 
  Speed: 798 MHz min/max: 800/2000 MHz Core speeds (MHz): 1: 798 2: 799 
  3: 799 4: 798 
  Vulnerabilities: Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 
  mitigation: Full AMD retpoline, STIBP: disabled, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: AMD Kabini [Radeon HD 8400 / R3 Series] vendor: Toshiba 
  driver: radeon v: kernel alternate: amdgpu bus ID: 00:01.0 
  chip ID: 1002:9830 
  Display: x11 server: X.Org 1.20.8 driver: ati,radeon unloaded: modesetting 
  alternate: fbdev,vesa display ID: :0.0 screens: 1 
  Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0") 
  s-diag: 414mm (16.3") 
  Monitor-1: HDMI-0 res: 1366x768 hz: 60 dpi: 60 
  size: 575x323mm (22.6x12.7") diag: 660mm (26") 
  OpenGL: renderer: AMD KABINI (DRM 2.50.0 5.8.6-1-MANJARO LLVM 10.0.1) 
  v: 4.5 Mesa 20.1.8 direct render: Yes 
Audio:
  Device-1: AMD Kabini HDMI/DP Audio driver: snd_hda_intel v: kernel 
  bus ID: 00:01.1 chip ID: 1002:9840 
  Device-2: AMD FCH Azalia vendor: Toshiba driver: snd_hda_intel v: kernel 
  bus ID: 00:14.2 chip ID: 1022:780d 
  Sound Server: ALSA v: k5.8.6-1-MANJARO 
Network:
  Device-1: Qualcomm Atheros AR8162 Fast Ethernet vendor: Toshiba 
  driver: alx v: kernel port: 2000 bus ID: 01:00.0 chip ID: 1969:1090 
  IF: enp1s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
  Device-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter 
  vendor: Lite-On driver: ath9k v: kernel port: 2000 bus ID: 05:00.0 
  chip ID: 168c:0036 
  IF: wlp5s0 state: down mac: <filter> 
Drives:
  Local Storage: total: 698.64 GiB used: 105.35 GiB (15.1%) 
  SMART Message: Required tool smartctl not installed. Check --recommends 
  ID-1: /dev/sda vendor: Toshiba model: MQ01ABD075 size: 698.64 GiB 
  block size: physical: 4096 B logical: 512 B speed: 3.0 Gb/s 
  rotation: 5400 rpm serial: <filter> rev: 3M scheme: GPT 
Partition:
  ID-1: / raw size: 691.10 GiB size: 679.25 GiB (98.29%) 
  used: 104.38 GiB (15.4%) fs: ext4 dev: /dev/sda2 
Swap:
  Kernel: swappiness: 60 (default) cache pressure: 100 (default) 
  ID-1: swap-1 type: partition size: 7.24 GiB used: 990.5 MiB (13.4%) 
  priority: -2 dev: /dev/sda3 
Sensors:
  System Temperatures: cpu: 70.2 C mobo: N/A gpu: radeon temp: 69 C 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 215 Uptime: 13h 07m Memory: 3.29 GiB used: 1.81 GiB (54.9%) 
  Init: systemd v: 246 Compilers: gcc: N/A Packages: pacman: 1151 lib: 378 
  flatpak: 0 Shell: Bash v: 5.0.18 running in: xfce4-terminal inxi: 3.1.05 

Memoria de video?

[mbb@mbb-laptop ~]$ lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C216 Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (Lewisville) (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4)
00:1c.3 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express Root Port 4 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM77 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C216 Chipset Family SMBus Controller (rev 04)
02:00.0 System peripheral: JMicron Technology Corp. SD/MMC Host Controller (rev 30)
02:00.2 SD Host controller: JMicron Technology Corp. Standard SD Host Controller (rev 30)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)

La tarjeta gráfica (VGA) es el dispositivo 00:02.0

[mbb@mbb-laptop ~]$ lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        DeviceName: 64
        Subsystem: Hewlett-Packard Company Device 18df
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 2000 [size=64]
        Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

Memoria de video es 256 MB

También:

[mbb@mbb-laptop ~]$ sudo dmidecode --type memory
[sudo] senha para mbb: 
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x0018, DMI type 16, 23 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: None
        Maximum Capacity: 16 GB
        Error Information Handle: Not Provided
        Number Of Devices: 2

Handle 0x0019, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x0018
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 8192 MB
        Form Factor: SODIMM
        Set: None
        Locator: Bottom-Slot 1(top)
        Bank Locator: BANK 0
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1600 MT/s
        Manufacturer: Hynix/Hyundai
        Serial Number: 441F2E7B
        Asset Tag: 9876543210
        Part Number: HMT41GS6MFR8C-PB  
        Rank: Unknown
        Configured Memory Speed: Unknown

Handle 0x001B, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x0018
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 8192 MB
        Form Factor: SODIMM
        Set: None
        Locator: Bottom-Slot 2(under)
        Bank Locator: BANK 2
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1600 MT/s
        Manufacturer: Hynix/Hyundai
        Serial Number: 2C26F9EE
        Asset Tag: 9876543210
        Part Number: 9905428-186.A00G  
        Rank: Unknown
        Configured Memory Speed: Unknown

Veo que tengo dos dimms de 8GB

Yo siento decirte que lo más probable es que tengas un slot estropeado o que un módulo de memoria sea defectuoso. Ya ha habido otros usuarios con problemas parecidos y siempre es lo mismo.

Puedes ver información sobre la memoria detectada con:

sudo inxi -m
sudo dmidecode --type Memory

tengo entendido que si las detecta
sudo inxi -m

Memory:
  RAM: total: 3.29 GiB used: 1.49 GiB (45.2%) 
  Array-1: capacity: 8 GiB slots: 2 EC: None 
  Device-1: DIMM 0 size: 4 GiB speed: 1334 MT/s 
  Device-2: DIMM 1 size: 4 GiB speed: 1600 MT/s 

sudo dmidecode --type Memory

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x0020, DMI type 16, 23 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: None
	Maximum Capacity: 8 GB
	Error Information Handle: 0x0029
	Number Of Devices: 2

Handle 0x0021, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0020
	Error Information Handle: 0x0023
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: SODIMM
	Set: None
	Locator: DIMM 0
	Bank Locator: CHANNEL A
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1334 MT/s
	Manufacturer: Not Specified
	Serial Number: 5B29D950
	Asset Tag: Asset Tag: 
	Part Number: HMT351S6BFR8C-H9  
	Rank: 2
	Configured Memory Speed: 1334 MT/s

Handle 0x0022, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: DIMM 0
	Bank Connections: None
	Current Speed: Unknown
	Type: DIMM
	Installed Size: 4096 MB (Single-bank Connection)
	Enabled Size: 4096 MB (Single-bank Connection)
	Error Status: OK

Handle 0x0025, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0020
	Error Information Handle: 0x0027
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: SODIMM
	Set: None
	Locator: DIMM 1
	Bank Locator: CHANNEL A
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1600 MT/s
	Manufacturer: Samsung
	Serial Number: E150025F
	Asset Tag: Asset Tag: 
	Part Number: M471B5273CH0-YK0  
	Rank: 2
	Configured Memory Speed: 1334 MT/s

Handle 0x0026, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: DIMM 1
	Bank Connections: None
	Current Speed: Unknown
	Type: DIMM
	Installed Size: 4096 MB (Single-bank Connection)
	Enabled Size: 4096 MB (Single-bank Connection)
	Error Status: OK

Handle 0x002B, DMI type 5, 20 bytes
Memory Controller Information
	Error Detecting Method: None
	Error Correcting Capabilities:
		None
	Supported Interleave: One-way Interleave
	Current Interleave: One-way Interleave
	Maximum Memory Module Size: 8192 MB
	Maximum Total Memory Size: 16384 MB
	Supported Speeds:
		Other
		Unknown
		70 ns
		60 ns
		50 ns
	Supported Memory Types:
		Other
		Unknown
		Standard
		FPM
		SIMM
		Burst EDO
	Memory Module Voltage: 3.3 V
	Associated Memory Slots: 2
		0x0022
		0x0026
	Enabled Error Correcting Capabilities:
		None
		Single-bit Error Correcting
		Double-bit Error Correcting
		Error Scrubbing

Haz un test de memoria con memtest86+ o alguna utilidad similar

También pudieras darle mtto, probar otro modulo de memoria en el slot, por cierto al encender la maquina no hace un pitido largo esto lo hace la placa base cuando existe un modulo defectuoso por ejemplo

opte por hacerle mantenimiento limpiando los módulos y los slots, después de ello la computadora me detecto los módulos de ram, pero igual presiento que algo terminara fallando muchas gracias por sus respuestas marco como solucionado.

Por pura casualidad ¿qué marca es la motherboard?

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