On Mon, 2019-11-18 at 21:07 -0400, George N. White III wrote:
> Correct. From hub.c
>
> /*
> * EM interference sometimes causes badly shielded USB devices
> * to be shutdown by the hub, this hack enables them again.
> * Works at least with mouse driver.
> */
> if (!(portstatus & USB_PORT_STAT_ENABLE)&& !connect_change && udev) {
> dev_err(&port_dev->dev, "disabled by hub (EMI?), re-
> enabling...\n");
> connect_change = 1;
> }
>
> USB3 devices can be sources of EMI.
You could have a mouse with unshielded wiring, some cheap mice give
scant regard to good building practices. And you could have a tiny
cable break due to metal fatigue.
I was forever getting logs about a mouse disconnecting. In my case,
it's one of the mice that perpetually goes into a sleep mode when
untouched, this upsets the system, which immediately wakes it up again.
--
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