[Nut-upsuser] Belkin F6C550-AVR

[Charles Lepple]

> From: Charles Lepple <clepple at gmail.com>
> To: Laszlo Hazy <hazy_l at yahoo.com>
> Cc: "nut-upsuser at lists.alioth.debian.org"
> <nut-upsuser at lists.alioth.debian.org>
> Sent: Monday, November 7, 2011 10:21:40 PM
> Subject: Re: [Nut-upsuser] Belkin F6C550-AVR
>
> On Nov 7, 2011, at 9:39 PM, Laszlo Hazy wrote:
>
>> The interesting thing is that lsusb does not show the UPS, which is weird
>> to me. And yes, the cable is plugged in and the USB port on the PC does work
>> (tried with a mass-storage device).
>
> This is key. If the kernel doesn't recognize the UPS as a valid USB device,
> neither will NUT.
>
> Have you tried running lsusb as root?
>
> Do you get any messages in dmesg when you plug in the UPS?

On Thu, Nov 10, 2011 at 9:50 AM, Laszlo Hazy <hazy_l at yahoo.com> wrote:
> Thanks for the reply.
> I did lsusb as root. The system logs are void of any reference to the UPS
> being connected/disconnected.

Sounds like a hardware problem.

> I changed the USB cable, replaced the
> batteries, it all did not matter. I have difficulty believing that the
> USBhardware or software stack in the UPS is broken, that just doesn't
> usually happen.

The microcontrollers in UPSes are generally very cheap. Have you tried
a 1.5 Mbit/sec USB device, such as a mouse or keyboard? They use a
different set of pull-up resistors than 12 Mb/s or 480 Mb/s devices,
and if there is a problem with the USB jack on the motherboard, it
might only manifest itself at one speed.

-- 
- Charles Lepple