You might try updating the bios. I have seen other reports of this issue and some of them were fixed via a bios update. While you are in the bios I would also check to see if there is an option to enable/disable AES.
These unfortunately are the only solutions I can provide as I am unfamiliar with this particular issue.
Thank you very much to TGrable for the comments above.
marcdom, Thank you very much for joining the Processors communities.
In regard to your inquiry, the information on our web site is the official documentation from Intel, so it should support AES, but in order to confirm that, we can run the Intel® processor diagnostics tool and at the end of the test it will report if it does support AES and PCLMULDQ:
Please let us know the results of running the tool.
Any further questions, please let me know.
Thank you Alberto and TGrable for your kind advice.
I am aware of the IPDT, but I need a Linux version of it and as far as I can see, there is some, but I would need to create a bootable USB stick 1st? I will try that nevertheless.
More context information:
The CPUs run on a Supermicro X8DTN+-F (Super Micro Computer, Inc. - Products | Motherboards | Xeon Boards | X8DTN+-F) and I contacted SuperMicro support also. I have been advised to try the newest BIOS update (2.1c) where a AES-NI on/off switch should be. I will try that today.
Not sure if the PCLMULDQ feature is somehow bound to AES-NI or if that would be a separate option in the BIOS. I will report about my findings.
I updated the BIOS (2.1c) and there is indeed a AES-NI enabled/disabled option. If I enable this, both AES and PCMULDQ appear in /proc/cpuinfo (as well as in the other diagnostics tools).
So these seem to go hand in hand.
So to answer the title: "No, I haven't" :-)
Thank you very much for your help. This is one of the cases where BIOS updates make sense (normally Supermicro tries to talk you out of it).