Comment # 11 on bug 1192288 from Olav Reinert

I believe Kernel:stable is for Tumbleweed only, so I used the Backports
repository instead:

https://download.opensuse.org/repositories/Kernel:/stable:/Backport/standard/

In there I found kernel-default-5.14.15, which I installed, and out comes:

# dmesg | grep EDAC
[    0.757458] EDAC MC: Ver: 3.0.0
[    6.854140] EDAC amd64: MCT channel count: 2
[    6.854188] EDAC MC0: Giving out device to module amd64_edac controller
F19h_M20h: DEV 0000:00:18.3 (INTERRUPT)
[    6.854189] EDAC amd64: F19h_M20h detected (node 0).
[    6.854192] EDAC MC: UMC0 chip selects:
[    6.854192] EDAC amd64: MC: 0:  8192MB 1:  8192MB
[    6.854193] EDAC amd64: MC: 2: 16384MB 3: 16384MB
[    6.854195] EDAC MC: UMC1 chip selects:
[    6.854196] EDAC amd64: MC: 0:  8192MB 1:  8192MB
[    6.854196] EDAC amd64: MC: 2: 16384MB 3: 16384MB
[    6.854197] EDAC amd64: using x16 syndromes.
[    6.854201] EDAC PCI0: Giving out device to module amd64_edac controller
EDAC PCI controller: DEV 0000:00:18.0 (POLLED)
[    6.854202] AMD64 EDAC driver v3.5.0

That clearly looks better, but there's no message that ECC is enabled, so I'm
not sure it works quite right.

The Ryzen 9 3900X paired with the same memory constellation produced this
output:

Oct 25 20:06:40 blackbox kernel: EDAC MC: Ver: 3.0.0
Oct 25 20:06:43 blackbox kernel: EDAC amd64: F17h_M70h detected (node 0).
Oct 25 20:06:43 blackbox kernel: EDAC MC: UMC0 chip selects:
Oct 25 20:06:43 blackbox kernel: EDAC amd64: MC: 0:  8192MB 1:  8192MB
Oct 25 20:06:43 blackbox kernel: EDAC amd64: MC: 2: 16384MB 3: 16384MB
Oct 25 20:06:43 blackbox kernel: EDAC MC: UMC1 chip selects:
Oct 25 20:06:43 blackbox kernel: EDAC amd64: MC: 0:  8192MB 1:  8192MB
Oct 25 20:06:43 blackbox kernel: EDAC amd64: MC: 2: 16384MB 3: 16384MB
Oct 25 20:06:43 blackbox kernel: EDAC amd64: using x16 syndromes.
Oct 25 20:06:43 blackbox kernel: EDAC amd64: Node 0: DRAM ECC enabled.
Oct 25 20:06:43 blackbox kernel: EDAC amd64: MCT channel count: 2
Oct 25 20:06:43 blackbox kernel: EDAC MC0: Giving out device to module
amd64_edac controller F17h_M70h: DEV 0000:00:18.3 (INTERRUPT)
Oct 25 20:06:43 blackbox kernel: EDAC PCI0: Giving out device to module
amd64_edac controller EDAC PCI controller: DEV 0000:00:18.0 (POLLED)
Oct 25 20:06:43 blackbox kernel: AMD64 EDAC driver v3.5.0