TGL devices only using/reporting one memory channel

[jacobgkau]

• Model: lemp10
• BIOS version: Tried current master firmware (2022-03-10_05577ba) and current release firmware (2021-07-20_93c2809).
• EC version: Same as above.
• OS: Pop!_OS 22.04 Pre-release & Pop!_OS 21.10

Like lemp9 was before it, lemp10 is being advertised as having dual-channel memory when ordering with 16GB of RAM (8GB soldered + 8GB DIMM). When running with RAM of the correct speed, lemp9 does show two channels in use in sudo dmidecode -t 17 output, but lemp10 only shows 1 channel in use (channel 0) even when using an 8GB 3200 MHz RAM stick.

Steps to reproduce

1. Populate lemp10 with an 8GB 3200 MHz RAM stick.
2. Boot and run sudo dmidecode -t 17.

Expected behavior

RAM should run in dual-channel mode when using a DIMM that matches the speed and size of the soldered RAM.

Actual behavior

RAM runs in single-channel mode even when matching the soldered RAM's size and speed.

Additional info

The customer was shipped a NMSO480E82-3200E (a web search shows it's Goldkey brand), and the Neo Forza sticks we have in the lab for testing report the same model number.

[crawfxrd]

Do other TGL models report single channel configuration?

All TGL models I have report single channel config.

[jacobgkau]

Do other TGL models report single channel configuration?

All TGL models I have report single channel config.

You're correct, darp7 with two identical RAM sticks (GKE800SO102408-2666A) reports both sticks in Channel 0.

[crawfxrd]

TGL changed memory init. ADL presumably has this issue as well.

May be changing the index in romstage spd_info or overriding DIMMS_PER_CHANNEL, but I'm not sure what exactly they do.

[crawfxrd]

Most likely it's only reporting it wrong and would require overriding SMBIOS data on every board.

Would need an FSP debug build to see what meminit actually does.

[witchof0x20]

Just chiming in to report I have this same issue on my gaze17 (ADL).

[adeptg]

Hello. darp8 (ADL):

sudo dmidecode -t 17

dmidecode 3.3

Getting SMBIOS data from sysfs. SMBIOS 3.3.0 present.

Handle 0x000A, DMI type 17, 40 bytes Memory Device Array Handle: 0x0009 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 32 GB Form Factor: SODIMM Set: None Locator: Channel-0-DIMM-0 Bank Locator: BANK 0 Type: DDR4 Type Detail: Unknown Synchronous Speed: 3200 MT/s Manufacturer: GSkill Serial Number: 09130517 Asset Tag: Channel-0-DIMM-0-AssetTag Part Number: F4-3200C22-32GRS Rank: 2 Configured Memory Speed: 3200 MT/s Minimum Voltage: 1.2 V Maximum Voltage: 1.2 V Configured Voltage: 1.2 V

Handle 0x000B, DMI type 17, 40 bytes Memory Device Array Handle: 0x0009 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 32 GB Form Factor: SODIMM Set: None Locator: Channel-0-DIMM-0 Bank Locator: BANK 0 Type: DDR4 Type Detail: Unknown Synchronous Speed: 3200 MT/s Manufacturer: GSkill Serial Number: 09130518 Asset Tag: Channel-0-DIMM-0-AssetTag Part Number: F4-3200C22-32GRS Rank: 2 Configured Memory Speed: 3200 MT/s Minimum Voltage: 1.2 V Maximum Voltage: 1.2 V Configured Voltage: 1.2 V

As I understand, it's the same issue - both planks are on the same channel

[witchof0x20]

gaze17 (ADL)

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.
# SMBIOS implementations newer than version 3.2.0 are not
# fully supported by this version of dmidecode.

Handle 0x000A, DMI type 17, 40 bytes
Memory Device
	Array Handle: 0x0009
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 32 GB
	Form Factor: SODIMM
	Set: None
	Locator: Channel-0-DIMM-0
	Bank Locator: BANK 0
	Type: DDR4
	Type Detail: Unknown Synchronous
	Speed: 3200 MT/s
	Manufacturer: GSkill
	Serial Number: 10250255
	Asset Tag: Channel-0-DIMM-0-AssetTag
	Part Number: F4-3200C22-32GRS
	Rank: 2
	Configured Memory Speed: 3200 MT/s
	Minimum Voltage: 1.2 V
	Maximum Voltage: 1.2 V
	Configured Voltage: 1.2 V

Handle 0x000B, DMI type 17, 40 bytes
Memory Device
	Array Handle: 0x0009
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 32 GB
	Form Factor: SODIMM
	Set: None
	Locator: Channel-0-DIMM-0
	Bank Locator: BANK 0
	Type: DDR4
	Type Detail: Unknown Synchronous
	Speed: 3200 MT/s
	Manufacturer: GSkill
	Serial Number: 10250256
	Asset Tag: Channel-0-DIMM-0-AssetTag
	Part Number: F4-3200C22-32GRS
	Rank: 2
	Configured Memory Speed: 3200 MT/s
	Minimum Voltage: 1.2 V
	Maximum Voltage: 1.2 V
	Configured Voltage: 1.2 V

[majal]

Reporting the same for gaze16:

sudo dmidecode | grep Locator

outputs:

Locator: Channel-0-DIMM-0
Bank Locator: BANK 0
Locator: Channel-0-DIMM-0
Bank Locator: BANK 0