Public bug reported:
dmidecode shipped in Ubuntu Server 26.04 incorrectly parses SMBIOS Type 17 DDR5
PMIC0 and RCD Revision Number fields. It prints "Device Type: Not Installed"
instead of the actual revision number. This is a dmidecode parsing bug. The
same bug exists in the upstream dmidecode source (versions 3.6, 3.7, and
current git master).
STEPS TO REPRODUCE:
1. Boot a system with DDR5 RDIMMs and SMBIOS >= 3.7. (Tested on Dell
PowerEdge, SMBIOS 3.8.0.)
2. Run:
sudo dmidecode -t 17 | grep -E "PMIC0|RCD"
ACTUAL OUTPUT:
PMIC0 Manufacturer ID: Bank 1, Hex 0x97
PMIC0 Device Type: Not Installed
RCD Manufacturer ID: Bank 7, Hex 0x32
RCD Device Type: Not Installed
EXPECTED OUTPUT:
PMIC0 Manufacturer ID: Bank 1, Hex 0x97
PMIC0 Revision Number: 0x0022
RCD Manufacturer ID: Bank 7, Hex 0x32
RCD Revision Number: 0x0011
SMBIOS v3.7.1 CR231 and v3.9 define SMBIOS Type 17 offsets 0x5E and 0x62
as 16-bit Revision Number WORDs for PMIC0 and RCD respectively. The
function dmi_memory_revision() in dmidecode.c incorrectly splits the
WORD into a high byte ("Device Type") and a low byte ("Device
Revision"). The high byte is 0x00, so dmidecode prints "Not Installed".
A patch has been submitted to the upstream dmidecode project on Savannah:
https://savannah.nongnu.org/patch/?10586
The patch modifies dmi_memory_revision() in dmidecode.c to correctly print the
full 16-bit WORD as a Revision Number for DDR5 (mem_type 0x22/0x23).
The patch can be used into the Ubuntu dmidecode package and include the fix in
the next Ubuntu 26.04 update.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2160976
Title:
dmidecode: DDR5 PMIC0/RCD Revision Number incorrectly reported as
"Device Type: Not Installed" on Ubuntu Server 26.04
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