[Nut-upsuser] UPS Losing Connection

[Kirk Bocek]

On 9/23/2020 1:09 PM, Stuart D. Gathman wrote:
> I solved this problem a few years back.
>
> https://github.com/sdgathman/trippfix
>
> The short answer is USB is broken on the model (but the power management
> is excellent, handling switchover to generator power without a hitch).
>
> The workaround is to do a usb port power off when the Tripplite USB
> hangs.  But hubs that actually implement this mandatory feature (must at
> least support powering all ports off) are getting hard to find. The USB
> chips implement it just fine. The hubs don't bother connecting the pins
> and just wire to +5V.
>
> The good news is that with CentOS-8, the kernel automatically does the 
> port power off, so you don't need my kludgey software fix when you go to
> 8.  You still need an actual standard conforming USB hub however.
> If the port on your server isn't, you can buy an external hub
> like I did.
>
>
Stuart, I haven't tried your program yet.

However the UPS appears to have dropped off completely. lsusb no longer 
shows the unit at all. So I physically unplugged and replugged it:

#dmesg
...
[252389.354190] hid-generic 0003:0557:2419.0002: usb_submit_urb(ctrl) 
failed: -19
[252389.403568] xhci_hcd 0000:00:14.0: USB bus 3 deregistered
[252389.405712] xhci_hcd 0000:00:14.0: xHCI Host Controller
[252389.407225] xhci_hcd 0000:00:14.0: new USB bus registered, assigned 
bus number 3
[252405.901391] xhci_hcd 0000:00:14.0: can't setup: -110
[252405.902631] xhci_hcd 0000:00:14.0: USB bus 3 deregistered
[252405.903033] xhci_hcd 0000:00:14.0: init 0000:00:14.0 fail, -110
[252405.903038] xhci_hcd: probe of 0000:00:14.0 failed with error -110

And it's still not there:

$lsusb
Bus 002 Device 002: ID 8087:8002 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:800a Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


So is this a faulty Tripplite that needs to be returned?