On Mon, 18 Nov 2019 at 17:24, fedorau...@online.de <fedorau...@online.de> wrote:
> On 18.11.19 21:46, Tom Horsley wrote: > ... > > > > I have no idea what an EMI is, but that's what starts everything. > > I guess it is "electromagnetic interference" > Correct. From hub.c <https://github.com/torvalds/linux/blob/master/drivers/usb/core/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. [...] -- George N. White III
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