USB4 is the public specification of Thunderbolt 3 protocol. Besides the kernel level changes () it also needs bolt to authorize the PCIe tunnels, very much as Thunderbolt 3. It is expected that USB4 hardware is accompanied with an IOMMU based DMA protection which the existing bolt (version 0.8) already supports. But there are additional information, including whether a system is Thunderbolt 3 or USB4 (hardware generation), that needs to be exposed, which require a newer (yet unreleased) bolt. Especially the hardware generation information is important for user facing tools and software like GNOME Settings to properly communicate the hardware information (read: "USB4" strings instead of "Thunderbolt", which could otherwise be confusing).
Built bolt-0.9-1.el8 (https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=1226118) for bolt 0.9.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (bolt bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.