I was using a X220 (i5 w/o USB 3) for a long time. This loyal companion died last week and I checked eBay for a replacement. Luckily, I was able to get a model with i7-2620M CPU. Then I moved the harddisk to the new machine and put it on my Mini Dock Plus Series 3 (4338-x0x) - the one with eSATA but w/o USB 3.0 with 135W power adapter.
Unfortunately, USB is not working on the dock with the new machine anymore. Network, DVI, DisplayPort and power supply are working fine. If I connect the USB device (keyboard, USB-Hub and mouse) directly to the Thinkpad it's working fine.
I have another Series 3 Dock (you never know when this comes in handy) but USB is also not working there.
After a bit of research I found a few tips for this issue with a different model, like unplugging the Dock before inserting the Thinkpad or booting w/o battery - none of this works. I have replaced all USB devices and connected them after boot one by one, this also doesn't help.
To be on the safe side, I also updated the BIOS to the latest version (from 2018).
I am using Linux (Fedora 31) but also tried using Windows 10 and the BIOS. The USB keyboard doesn't work in either of those.
These are the devices shown by lsblk when connected the Keyboard to the dock (well, you don't see the keyboard):
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Bus 002 Device 003: ID 0bdb:1911 Ericsson Business Mobile Networks BV Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 0a5c:217f Broadcom Corp. BCM2045B (BDC-2.1) Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Any help would be appreciated.