The `logitech-hidpp-device` is the Logitech unified receiver I have
connected to the dock. It always generates lots of error messages like
this, even when connected directly to the computer's built-in USB port.

There's another Logitech unified receiver connected to the computer
itself, for the mouse that travels with the laptop, and that doesn't do
this behavior, it just looks like this (w/o debug logs):

Dec 31 17:11:42 vesho kernel: usb 1-1: New USB device found, idVendor=046d, 
idProduct=c52b, bcdDevice=12.10
Dec 31 17:11:42 vesho kernel: usb 1-1: New USB device strings: Mfr=1, 
Product=2, SerialNumber=0
Dec 31 17:11:42 vesho kernel: usb 1-1: Product: USB Receiver
Dec 31 17:11:42 vesho kernel: usb 1-1: Manufacturer: Logitech
Dec 31 17:11:42 vesho kernel: logitech-djreceiver 0003:046D:C52B.0090: 
hiddev0,hidraw1: USB HID v1.11 Device [Logitech USB Receiver] on 
usb-0000:00:14.0-1/input2
Dec 31 17:11:42 vesho kernel: logitech-hidpp-device 0003:046D:4026.0091: HID++ 
2.0 device connected.
Dec 31 17:11:42 vesho kernel: input: Logitech T400 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.2/0003:046D:C52B.0090/0003:046D:4026.0091/input/input115
Dec 31 17:11:42 vesho kernel: logitech-hidpp-device 0003:046D:4026.0091: 
input,hidraw2: USB HID v1.11 Keyboard [Logitech T400] on 
usb-0000:00:14.0-1/input2:1

According to fwupdmgr, they are both running an up to date firmware
(both got updated recently, though they have a different
"VersionBootloader" where the OK one has "BOT01.02_B0014" and the
problematic one has "BOT01.02_B0015".

Interestingly enough, at one point I got the "unknown event type 15"
error from lp1766076 immediately when plugging in the problematic
receiver to the dock, but I didn't manage to reproduce that.

I'm going to try to work without the problematic receiver for a bit and
see if things improve.

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https://bugs.launchpad.net/bugs/1856161

Title:
  Thunderbolt dock fails to connect USB devices

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