UZB1 USB controller bug

[dawn parrot]

Hello, I noticed in the last update tyo Z-Wave JS https://github.com/zwave-js/node-zwave-js/pull/7225/commits/af2209189314a27673f87b419a722187e9775e40 it says "This controller has a bug in its USB implementation, which can cause issues with newer Linux kernel versions. Using a powered USB hub MAY help to work around the issue, but migrating to a different controller is recommended."

Is there any more information about this bug and the issues it can cause as I have one and it's been fine so far? I run HASS OS on a RPi 4 if that helps.

[river tapir]

From what I've been told, newer Linux kernel version fail to initialize the USB connection, since that controller takes too long to respond to the USB enumeration.

https://github.com/home-assistant/operating-system/issues/2995

HAOS is patching the kernel to revert to the old behavior (where it essentially worked by accident), but these patches are planned to be removed in the future.

Powered USB hubs may help, since the controller is powered first, and the USB enumeration can happen at a later time when it is ready to respond.

[dawn parrot]

Thanks for the additional information, appreciated