Hi Fabian,
We support OFED drivers only. Since, you are not using OFED and also the OS that is being used is not Supported, it would be great if you could open a case with OS vendor. Also, I’d like to bring to your notice that the card you are using is End of Life(EOL) . This can be validated from following link —> https://www.mellanox.com/page/eol
Thanks,
Namrata.