Daniel Roschka

Great you figured out what the issue was. :+1: Your solution suggests disabling any kind of authorization for devices connected via Thunderbolt. That's a major security gap, as it allows...

@mfauvain: To rule out hardware problems: Does Thunderbolt work with macOS?

So the problems are not only limited to Thunderbolt, but affect USB as well? That doesn't sound good. Have you tried different Linux distributions to rule out problems with the...

Ah, so everything directly attached to the Thunderbolt 3 ports works, but as soon as you put a Thunderbolt-3-to-2-adapter in the middle it stops working? What display are you using?...

I'm not sure if that adapter already known to work. There is a bug report in the Kernel Bugzilla about it: https://bugzilla.kernel.org/show_bug.cgi?id=189731 Mind that this bug report is using it...

> can anything be 'written' to that adpter's chip? The adapter contains firmware as well, which might get updated. I'm not sure how the process for that looks like though....

Something must have changed on software-side. You already confirmed that you didn't do a kernel update nor a macOS update between the Thunderbolt connections working and not. Any other changes...

Looking at the [latest changes to upstream `linux-firmware`](https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/log/) I don't see anything which would suggest that it's the new firmware package that fixed it. Mysterious. :thinking:

@mfauvain @kayateia : Any updates regarding this issue? Is this now working for you?

Congrats for getting it to work. As I've a MacBookPro 13,2 without a separate AMD GPU I won't be able to benefit from your findings. Anyway, as this aims to...