[Nut-upsuser] USBDEVFS_CONTROL failed cmd usbhid-ups

[Arjen de Korte]

Citeren Thomas Gutzler <thomas.gutzler op gmail.com>:

> In your last email you mentioned that you are receiving an EATON Ellipse
> UPS yourself. Did you have any luck reproducing any of the errors I
> reported? Maybe further insight or suggestions how to tackle this problem?

Yes, I could reproduce the errors. It turned out that the UPS was  
returning an EPIPE error, indicating it couldn't complete a request.  
This in itself is a (temporary) error condition from the UPS (there is  
nothing we can do to prevent that). But what happened previously, is  
that the driver dropped the connection an it reconnected. That isn't  
necessary, it is sufficient to just retry. So you'll probably still  
see the occasional error from this UPS, it is just handled much better  
by the driver.

Best regards, Arjen
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