Thank you for providing as much information as you did. It is definitely helpful to be able to know
I know it has been a bit since you posted on the community, and I hope that you have had the opportunity to resolve your issue by now. Please, let me know if you have.
Otherwise, I would recommend calling in to have a tech come and replace the card first. If that doesn't work, then there may need to be other resolutions. If you have updated the driver, bios, and other software, then hardware is the only other culprit available. Typically, this is the card itself or the port it is connected to.
Also, please understand that it being represented as a 6900m series is nothing to be concerned with. Depending on where you look, it may just recognize it only as a 6900m series and that is perfectly fine.
Husband/Father/Writer/Tech Guru/Broad Spectrum Gamer
"My greatest experience in fixing electronics has come from having kids" -CCC