Comment # 7 on bug 1213365 from Michael Hirmke

(In reply to Takashi Iwai from comment #6)
> And does it happen *always* when NI box is plugged?  The error -71 is
> -EPROTO, and it often indicates some firmware problem...

It always happens, yes.
And maybe it is a firmware problem, but it worked for a long time until I
installed 6.4.x. And - the box is too old to get new firmware.
And - it always works after unplugging the box and plugging it in again.

And - as I wrote: There are problems with many of my usb devices since I
installed 6.4.x. For example the keyboad isn't available for a few seconds in
the plymouth passphrase dialog for the encrypted root partition.

It looks to me as if in 6.4.x the code for usb/usb-c/thunderbolt devices and
boxes has been modified heavily.