Changing from passthrough to non-passthrough devices fails to take effect after a reboot
/etc/vmware/esx.conffile by changing the owner of the PCI device from passthru to vmkernel.
Example of the edit:
/device/000:02.0/owner = "passthru"
/device/000:02.0/owner = "vmkernel"
Replace 000.02.0 with the PCI address of the device. You can it fro ESXi Dashboard.
Reboot the ESXi host.
Note: for some reason if the line is not there, adding it does not work.