Interesting your Alix uses the ehci_hcd driver while the net5501 uses the 
ohci_hcd driver, not sure that has anything to do with it.

Lonnie

On Feb 7, 2014, at 4:25 PM, Lonnie Abelbeck wrote:

> Hi Ryan,
> 
> I have an old net5501 with a APC Back-UPS ES 550 connected to it, uptime of 
> 26 days and syslog only shows:
> --
> Jan 12 08:31:30 voip1 user.info kernel: usbhid: USB HID core driver
> Jan 12 08:31:30 voip1 user.info kernel: usb 2-1: new low speed USB device 
> using ohci_hcd and address 2
> Jan 12 08:31:30 voip1 user.info kernel: generic-usb 0003:051D:0002.0001: 
> hiddev96: USB HID v1.10 Device [APC Back-UPS ES 550 FW:843.K2 .D USB FW:K2 ] 
> on usb-0000:00:15.0-1/input0
> --
> 
> I would try a different USB cable, preferably with a ferrite core on it, and 
> possibly rearrange the USB cable to minimize interference.
> 
> On my test bed I witnessed USB resets when the UPS went off line (I pulled 
> the plug) but when the USB cable was moved and was not draped/touching over 
> the UPS the resets went away.
> 
> Lonnie
> 
> 
> On Feb 7, 2014, at 3:57 PM, Ryan Bantz wrote:
> 
>> Hello,
>> 
>> I am plugged in an UPS into an Alix device to test the new NUT package. I 
>> see the device frequently disconnect in the log. Does this appear to be a 
>> hardware or driver issue?
>> 
>> I have tried a different UPS and experienced the same results.
>> 
>> Feb  4 09:38:06 pbx user.info kernel: usb 1-3.4: USB disconnect, address 5
>> Feb  4 09:38:07 pbx user.info kernel: usb 1-3.4: new low speed USB device 
>> using ehci_hcd and address 6
>> Feb  4 09:38:08 pbx user.info kernel: generic-usb 0003:09AE:3015.0003: 
>> hiddev96: USB HID v1.10 Device [Tripp Lite  TRIPP LITE SMART1500RM2U ] on 
>> usb-0000:00:13.5-3.4/input0
>> Feb  4 09:38:22 pbx user.info kernel: usb 1-3.4: USB disconnect, address 6
>> Feb  4 09:38:22 pbx user.info kernel: usb 1-3.4: new low speed USB device 
>> using ehci_hcd and address 7
>> Feb  4 09:38:23 pbx user.info kernel: generic-usb 0003:09AE:3015.0004: 
>> hiddev96: USB HID v1.10 Device [Tripp Lite  TRIPP LITE SMART1500RM2U ] on 
>> usb-0000:00:13.5-3.4/input0
>> Feb  4 09:38:36 pbx user.info kernel: usb 1-3.4: USB disconnect, address 7
>> Feb  4 09:38:37 pbx user.info kernel: usb 1-3.4: new low speed USB device 
>> using ehci_hcd and address 8
>> Feb  4 09:38:38 pbx user.info kernel: generic-usb 0003:09AE:3015.0005: 
>> hiddev96: USB HID v1.10 Device [Tripp Lite  TRIPP LITE SMART1500RM2U ] on 
>> usb-0000:00:13.5-3.4/input0
>> Feb  4 09:38:52 pbx user.info kernel: usb 1-3.4: USB disconnect, address 8
>> Feb  4 09:38:52 pbx user.info kernel: usb 1-3.4: new low speed USB device 
>> using ehci_hcd and address 9
>> Feb  4 09:38:52 pbx user.info kernel: generic-usb 0003:09AE:3015.0006: 
>> hiddev96: USB HID v1.10 Device [Tripp Lite  TRIPP LITE SMART1500RM2U ] on 
>> usb-0000:00:13.5-3.4/input0
>> Feb  4 09:39:06 pbx user.info kernel: usb 1-3.4: USB disconnect, address 9
>> Feb  4 09:39:07 pbx user.info kernel: usb 1-3.4: new low speed USB device 
>> using ehci_hcd and address 10
>> Feb  4 09:39:08 pbx user.info kernel: generic-usb 0003:09AE:3015.0007: 
>> hiddev96: USB HID v1.10 Device [Tripp Lite  TRIPP LITE SMART1500RM2U ] on 
>> usb-0000:00:13.5-3.4/input0
>> Feb  4 09:39:21 pbx user.info kernel: usb 1-3.4: USB disconnect, address 10
>> 
>> -Ryan


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