To add to above:
When the error is on, running `sudo lshw` causes the program to hang:
fox:~% sudo lshw
USB<-- program hang like this
--
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/18
I can confirm this issue in 20.04 linux-image-5.4.0-42. This message
only appear for my usb3.1 gen1 type-c hub when it is connected on boot.
If I re-plug the hub after boot, the message stops. It doesn't appear
for another connected usb3 type-a hub.
In /var/log/syslog, it prints every 4 seconds:
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