Comment 9 for bug 1726299
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bbfa235
(Get the code!)
According to the dmesg output the adapter only shows up as a USB device.
On non-Macs the firmware is responsible for setting up PCI tunnels and DisplayPort tunnels over Thunderbolt. Apparently it doesn't do that for devices behind this adapter, so the firmware needs to be extended.
Please ask Dell for a BIOS update. Best case they'll manage to get this working in collaboration with Intel engineers, worst case they'll respond that they don't support Apple's adapter. Mario Limonciello <email address hidden> is an engineer at Dell who's worked on Thunderbolt compatibility. Amir Levy <<email address hidden> is an engineer at Intel familiar with the Thunderbolt firmware driver.