Hello fellow keyboard warriors! I’ve been troubleshooting a pretty weird USB issue and could use some insight.

💻 Setup

• Lenovo IdeaPad Flex 5i Chromebook (2022, Tiger Lake i3-1115G4)
• Fully converted using MrChromebox UEFI firmware (ChromeOS completely removed)
• Running Kali Linux (rolling)

🔌 Ports (for clarity)

• L-C = Left USB-C
• L-A = Left USB-A
• R-C = Right USB-C

❗ Issue

Only ONE USB-C port works at a time. I can switch which one works depending on boot parameters, but I’ve never gotten both working simultaneously.

🔁 Behavior

Mode A (default boot):

• L-C → ✅ working
• R-C → ❌ not working
• L-A → ❌ not working

Mode B (with pci=assign-busses):

• L-C → ❌ not working
• R-C → ✅ working
• L-A → ❌ not working

Tried forcing both → either doesn’t work or causes instability (black screen boot when adding pci=realloc).

🛠️ What I’ve tried

• Tons of GRUB params:
  • intel_iommu=on, iommu=pt
  • usbcore.old_scheme_first=1
  • pcie_aspm=off
  • pci=assign-busses / pci=realloc
• Reloading xHCI drivers
• Unbind/rebind USB controllers
• PCI remove/rescan
• Forcing USB-C roles via /sys/class/typec
• Custom reset scripts

Nothing gets both ports working together.

🧠 Observations

• Two controllers show up (00:14.0 and 00:0d.0)
• Looks like only one is initialized depending on boot config
• Feels like a firmware / ACPI / USB-C mux issue from the Chromebook side

🎯 Goal

At minimum: both USB-C ports working
Ideally: all ports (including USB-A)

❓ Questions

• Anyone seen this on Tiger Lake Chromebooks?
• Known kernel quirk / workaround?
• Is this a MrChromebox firmware limitation?
• Anything involving Thunderbolt / USB-C mux I should look into?

Happy to provide logs if needed.

Appreciate any help, this one’s been a rabbit hole 😅