Ok, so rolling back the BIOS fixed it. I had to roll back 3 versions to get it working, and funny enough, this version of the BIOS doesn't even have a VT-d setting.
For anyone having this issue with a 7947-52U, use BIOS version ibm_fw_uefi_d6e150c-1.11_windows_32-64 released Feb 16, 2011...
Thanks for the reply. I will do that. I plan on rolling back 1 version at a time until it works.
Also, you think its worth going back to 5.0? I also do not have the IBM customized version of ESXi. That might be worth a try as well.
I have an IBM x3650 M2 7947-52U. I initially had ESXi 5.0 installed, and upgraded to 5.1 a few months ago. I also upgrade my BIOS during that time as well.
Before any of those upgrades, I had DirectPath working. I was planning on passing through a BR10i SAS controller to a Nexenta VM...