[Nut-upsuser] Usbhip-ups going wild

Antoine Gatineau antoine.gatineau at alcatel-lucent.com
Wed Aug 12 11:50:42 UTC 2009

So this is hardware related.
The hardware is in a big lab with AC and a lot of other servers and
electronic cards so the EM must be quite big there.

I think everything is fine for me now. Thanks a lot for your time and help.

I will update with url for RHEL4 and RHEL5 packages as soon as it is
accepted by Fedora/EPEL people :)


-----Message d'origine-----
De : Charles Lepple [mailto:clepple at gmail.com] 
Envoyé : mercredi 12 août 2009 13:31
À : Antoine Gatineau
Cc : nut-upsuser List
Objet : Re: [Nut-upsuser] Usbhip-ups going wild

On Aug 11, 2009, at 4:37 AM, Antoine Gatineau wrote:

> On the machine connected to a MGE Evolutipn 1250, I got this message 
> during the night :
> Aug 10 23:44:17 localhost kernel: hub 3-0:1.0: port 2 disabled by hub 
> (EMI?), re-enabling...
> Aug 10 23:44:17 localhost kernel: usb 3-2: USB disconnect, address 14 
> Aug 10 23:44:26 localhost kernel: usb 3-2: new low speed USB device 
> using address 16
> It doesn't really bother me because it is reconnected in 10 seconds 
> but isn't there some issue here?
> It is the kernel that disconnects the device but I wonder why...

The kernel is disconnecting it, but that is based on a signal from the root
hub hardware (probably on your motherboard).

The EMI is likely caused by insufficient isolation between the USB hardware
and the power switching circuitry in the UPS.

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