On 22.05.2017 15:57, Hans Petter Selasky wrote:

> What is the occurrence rate of this IOERROR? Once per attach/detach.
> Did you try to connect the USB device to a different port and/or USB HUB.
> It might also be that the user-space driver tries to reset the device
> when it sees this error. To figure that out you'll need to enable
> debugging in the UPS software package.
 Hans, as here are some evidences, that Linux doesn't have this problem,
I want to track down it and help you to fix it, if it is fixable on
FreeBSD side (maybe, with some kludge for such devices).

 I know next to nothing about Linux and USB internals, but I'm ready to
test patches, get any dumps, try to boot Linux on this hardware and get
dumps there, etc.

 Thank you!

// Lev Serebryakov

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