[Nut-upsuser] Need help with Unitek Alpha 1200sx.

Alexander I. Gordeev lasaine at lvk.cs.msu.su
Wed Oct 8 22:00:41 UTC 2008

Hi Joseph,

Nice to see you again :)

On Tuesday 07 October 2008 23:21:32 Joseph Borg wrote:
> Hi,
> Apologies for picking up on this old thread but I never had gotten this
> issue resolved and I'm now back in the location where the UPSs are so I was
> hoping we could look into the issue again.
> Basically, I had two Unitek Alpha 1200sx UPSs, connected to Fedora Linux 8.
> The NUT version seems to be:
> Network UPS Tools upsd 2.2.0-
> not listening on port 3493
> The driver seems to be the megatec_usb driver. The problem I have is that
> this only seems to work occasionally (I typically have to restart the
> deamon several times, switch on/off the UPSs etc in order to get it to
> work). Most of the time, the controller seems to fail to start up and I
> subsequently get the following message:
> Broadcast message from nut (Tue Oct  7 21:14:44 2008):
> UPS unial1200 at localhost is unavailable
> I'm not quite sure what other information you'd need. That said, I can
> provide any output requested.
> Thanks in advance for helping me out.
> Joe

First of all I suggest you to update your NUT to the latest version. There is 
at least one reason for that - megatec_usb driver now supports automatic 
reconnection after link fail. This is not a fix.

I have several suspects on this subject:

1. hardware.

Something could not ok in both UPSes (not very likely) or in the USB host 
hardware. Try connecting the UPSes to other machines.

2. software

It could be everything: kernel, udev, NUT... I think strace-ing megatec_usb 
can help.


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