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ASRock X570 ITX/TB3 and Belkin Thunderbolt 3 Dock Plus on Linux

I have this fantastic setup where my desktop PC is thunderbolted away to the next door room through a wall so I have a completely silent system. Trouble is, I can’t get my dock working in openSUSE Tumbleweed despite it being connected and authorized, and I suspect it might have something to do with the motherboard and BIOS (v2.30) based upon this thread:
[thisforumrootaddress]/t/asrock-x570-phantom-tb3-itx-and-linux-no-bus-number-available-for-hot-added-bridge/156951

I have the same message in ‘dmesg’ – “No bus number available for hot added bridge” – even with the newest BIOS, and the other solutions in the thread don’t work for me (not even BIOS v1.20). However, with other versions (I think v1.20 and 1.78, although I forget whether it was with the kernel parameters or not) I get something different in ‘dmesg’ (thunderbolt device gets disconnected after something fails) albeit the same end result.

The dock works fine on Windows 10, although I’ve yet to test display since I don’t have a DP cable (it’s on its way) to connect to the motherboard input and GPU. I’ve even tried to install the thunderbolt utility ASRock provides on their download page and install it using wine with ‘msiexec’, but that was a dead end.

Anyway, any help debugging and hopefully getting this to work would be greatly appreciated. I’ve already contacted Belkin themselves who would get back to me with more competent people apparently.

OP,

Thunderbolt is still a mess in the *nix world because Intel is dragging their feet. @Wendell has been able to get thunderbolt working on AMD stuff with quite a few hacks and particular sets of hardware.

USB4 seems to be getting work done in the Linux kernel since it is an open standard so you will more than likely have to wait until that official release before you even see any real work on Thunderbolt 3 in the *nix world.

If you really want docked GNU/Linux action right now, you are going to need to go with a USB3 dock instead.

Thanks for the reply. I looked up USB4, and it seems it came with kernel v5.6, but openSUSE Tumbleweed is already on 5.7.7.

Here’s what dmesg currently shows:

thunderbolt 0-1: new device found, vendor=0x13 device=0x109a
thunderbolt 0-1: Belkin Thunderbolt 3 Dock Plus
pciereport 0000:00:01.1: PME: Spurious native interrupt!
pciereport 0000:05:01.0: pciehp: Slot(1): Card present
pciereport 0000:05:01.0: pciehp: Slot(1): Link up
pci 0000:07:00.0: [8086:15ef] type 01 class 0x060400
pci 0000:07:00.0: enabling Extended Tags
pci 0000:07:00.0: supports D1 D2
pci 0000:07:00.0: PME# supported from D0 D1 D2 D3hot D3cold
pci 000:07:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:05:.0 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link)
pci 0000:07:00.0: No bus number available for hot-added bridge
pcireport 0000:05:01.0: PCI bridge to [bus 07]
pcireport 0000:05:01.0: bridge window [io 0xc000-0xcfff]
pcireport 0000:05:01.0: bridge window [mem 0xd4000000-0xd41fffff]
pcireport 0000:05:00.0: bridge window [mem 0x90000000-0x901fffff 64bit pref]

It almost reads to me that it supports DisplayPort at least? Will have to wait until the DP cable comes to test it though.

Does not look like their are any issues except that it cannot find a bus number for one of the PCI interfaces.

I just don’t have any experience with TB because it has never really worked on GNU/Linux until the 4.19 kernel, if I recall correctly.