### System details

MacBook Pro with T2 chip (16-inch, 2019): Intel i7-9750H, 16GB RAM. Omarchy 4.0.3-1, Linux 7.2.4-arch1-Watanare-T2-2-t2

### What's wrong?

Hi there! I've installed Omarchy 4.0.3-1 onto my Intel-based MacBook Pro (16-inch, 2019).
It seems that it doesn't detect any USB Flash drives connected to the laptop unless it has already been plugged-in during boot. 
Hot-plug did work fine in my T2 Arch Linux setup on this same machine.

When I plug/unplug USB device lsblk/lsusb doesn't show anything at all. No system events (dmesg -w), nothing.

```
lsusb -t shows:

Bus 001: xHCI
Bus 002: xHCI
Bus 003: xHCI
Bus 004: xHCI
Bus 005: xHCI
Bus 006: xHCI
Bus 007: BCE VHCI
```

```
Command:

lspci -nn | grep -Ei 'usb|thunderbolt'

produced:

00:14.0 USB controller [0c03]: Intel Corporation 300/C240 Series Chipset Family USB 3.1 xHCI [8086:a36d] (rev 10)

06:00.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
07:00.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
07:01.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
07:02.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
07:04.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
08:00.0 System peripheral [0880]: Intel Corporation JHL7540 Thunderbolt 3 NHI [Titan Ridge 4C 2018] [8086:15eb] (rev 06)
09:00.0 USB controller [0c03]: Intel Corporation JHL7540 Thunderbolt 3 USB Controller [Titan Ridge 4C 2018] [8086:15ec] (rev 06)

7c:00.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
7d:00.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
7d:01.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
7d:02.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
7d:04.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
7e:00.0 System peripheral [0880]: Intel Corporation JHL7540 Thunderbolt 3 NHI [Titan Ridge 4C 2018] [8086:15eb] (rev 06)
7f:00.0 USB controller [0c03]: Intel Corporation JHL7540 Thunderbolt 3 USB Controller [Titan Ridge 4C 2018] [8086:15ec] (rev 06)
```

**Kernel modules**

```
Command:

lsmod | grep -Ei 't2|bce|thunderbolt|xhci'

produced:

t2bce_audio
snd_pcm
snd
thunderbolt
t2bce_vhci
t2bce_core
t2bce_dma
```


**Specifically:**

```
t2bce_audio            77824  3
thunderbolt           614400  0
t2bce_vhci             90112  0
t2bce_core             53248  2 t2bce_audio,t2bce_vhci
t2bce_dma              32768  1 t2bce_core
```

The T2 BCE modules are therefore loaded and functioning.

**Important dmesg findings**

```
The kernel successfully initializes the T2 BCE stack:

t2bce_dma: module initialized
t2bce_core: device initialized
t2bce_core: module initialized
t2bce_vhci: BCE VHCI Host Controller
t2bce_vhci: new USB bus registered, assigned bus number 7
t2bce_vhci: device initialized
t2bce_vhci: module initialized

```

Internal Apple devices subsequently enumerate successfully.
Thunderbolt initialization produces these two important messages:

```
thunderbolt 0000:08:00.0: device links to tunneled native ports are missing!
thunderbolt 0000:7e:00.0: device links to tunneled native ports are missing!
```

There are no USB hotplug messages when the external USB drive is connected.

**Thunderbolt service**

bolt is installed and running:
bolt.service loaded active running Thunderbolt system service
t2-bce.service does not exist, which is expected; T2 BCE functionality is provided through kernel modules rather than a t2-bce systemd service.
t2fanrd.service is also running:
t2fanrd.service loaded active running

**Thunderbolt domains**

```
sudo boltctl domains

produced:

● domain0 c7010000-0062-640e-8360-3c8d8811b102
   ├─ bootacl:  0/0
   └─ security: user

● domain1 bf010000-0082-8c0e-0346-a28d8490ba02
   ├─ bootacl:  0/0
   └─ security: user
```


boltctl list is empty.

So important conclusions so far:

- This is not currently a filesystem/mounting problem.
- The external USB device isn't even being enumerated by Linux.
- T2 BCE functionality is loaded and internal T2 USB devices work.
- USB xHCI controllers are present.
- Thunderbolt controllers are present.
- bolt.service is running.
- Thunderbolt reports: device links to tunneled native ports are missing!