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Bug #627

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LE

Lenovo ThinkPad X280 (20KE) only shows 4GB of RAM out of 16GB

Bug #627: Lenovo ThinkPad X280 (20KE) only shows 4GB of RAM out of 16GB

Added by Ladislav Ezr 7 days ago. Updated 6 days ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
board support
Target version:
none
Start date:
02/11/2026
Due date:
% Done:

0%

Estimated time:
Affected versions:
main
Needs backport to:
Affected hardware:
Lenovo ThinkPad X280
Affected OS:
all

Description

Hi,
X280 (20KE-S2EW08) flashed with main coreboot (git clone a few hours ago). Only shows 4GB of RAM when it's actually a 16GB model.

Files

Download all files
X280 coreboot .config.txt (28.3 KB) X280 coreboot .config.txt Ladislav Ezr, 02/11/2026 03:16 PM
X280 cbmem -1 log.txt (54 KB) X280 cbmem -1 log.txt Ladislav Ezr, 02/11/2026 03:17 PM
PXL_20260212_003814426.jpg (205 KB) PXL_20260212_003814426.jpg Ladislav Ezr, 02/12/2026 08:50 AM
PXL_20260212_095432184.MV.jpg (328 KB) PXL_20260212_095432184.MV.jpg Ladislav Ezr, 02/12/2026 10:10 AM

PR Updated by Patrick Rudolph 6 days ago Actions
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 #1

According to the log it detects 2x "K4AAG165WB-MCRC". Maybe the capacity in the SPD file is incorrect? I don't see SPD files checked into the mainboard dir, so I cannot verify.

LE Updated by Ladislav Ezr 6 days ago Actions
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 #2

Patrick Rudolph wrote in #note-1:

According to the log it detects 2x "K4AAG165WB-MCRC". Maybe the capacity in the SPD file is incorrect? I don't see SPD files checked into the mainboard dir, so I cannot verify.

It actually chooses the correct SPD file. I have used the SPD file provided by coreboot (spd/ddr4/set-0/spd-9.hex). This file is not specified in the memory Makefile.mk of the X280.

LE Updated by Ladislav Ezr 6 days ago Actions
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 #3

Patrick Rudolph wrote in #note-1:

According to the log it detects 2x "K4AAG165WB-MCRC". Maybe the capacity in the SPD file is incorrect? I don't see SPD files checked into the mainboard dir, so I cannot verify.

Fixed by applying https://review.coreboot.org/c/coreboot/+/91170
Please mark as closed.

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