I have X1 Extreme Gen2 and Thunderbolt 3 Workstation Dock. The docking stations works, but ports including USB and HDMI stop working intermittently, but frequently.
I have all new firmware loaded. 2x 4K monitors connected to the docking HDMI ports.
When HDMI stops working, monitor tells me out of signal. However xrandr keep saying connected.
Is there any way to debug whether the problem is Linux TB driver or the docking station?
boltctl
● Lenovo ThinkPad Thunderbolt 3 Dock
├─ type: peripheral
├─ name: ThinkPad Thunderbolt 3 Dock
├─ vendor: Lenovo
├─ uuid: 00eb3025-0660-0801-ffff-ffffffffffff
├─ generation: Thunderbolt 3
├─ status: authorized
│ ├─ domain: cc030000-0082-841e-836f-3883a641a201
│ ├─ rx speed: 40 Gb/s = 2 lanes * 20 Gb/s
│ ├─ tx speed: 40 Gb/s = 2 lanes * 20 Gb/s
│ └─ authflags: none
├─ authorized: Sun 13 Dec 2020 22:38:07
├─ connected: Sun 13 Dec 2020 22:38:07
└─ stored: Tue 20 Oct 2020 12:54:15
├─ policy: iommu
└─ key: no