[Bug 244517] Thinkpad X1 tablet 3rd gen: USB-C does not work

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244517

--- Comment #4 from Scott Long <scottl at FreeBSD.org> ---
Hi,

I'm assuming that this is a Thunderbolt 3 port, since it's a USB-C connector
and your devices aren't showing up in the OS.  There are some unfortunate and
confusing hardware design decisions with TB3 that make it hard to work with. 
I'm finishing up a driver right now and intend to make it available for testing
in the next few days.  In the mean time, I recommend that you open up the BIOS
on the laptop and see if there are any controls related to Thunderbolt 3.  If
there are, you might find a control for the hardware security model, with
options for "none", "user", "display port", and "key exchange", or some similar
words.  You can try setting the security model to "none" and see if that allows
your USB hardware to show up when you plug it in.  Even if it does, there might
still be some problems with the hardware not working or invoking endless
internal resets, but it'll at least be some good data to collect.  I'll update
this bug report once I have some code that can be tested.

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