[Nut-upsuser] Cyber power CP1500AVR required pollonly?

[Dave Williams]

IMHO adding to the logging to suggest pollonly would be a good start.
I wouldnt advocate changing on the fly - thats likely to lead to
instability or confusion. 

On my CP900EPFCLCD I need to run pollonly albeit when connected to old
USB 1.5 ports. I thought it was the port not the UPS that was the
problem - maybe I was jumping to conclusions.

Dave

On 17:30, Mon 06 Jun 22, Jim Klimov via Nut-upsuser wrote:
> According to issues discussed over the past year or so on github, seems so
> - that at least some models and/or OSes and/or chipsets have a problem with
> libusb interrupt mode; more often failing during device discovery than
> after some successful uptime.
> 
> I don't think there was reliable statistics to incriminate certain
> situations enough to hardcode some preferences however.
> 
> Maybe it could help generally to at least log the suggestion for pollonly
> (or interruptonly) when the preferred method fails. Or at best try to
> change the preference on the fly if not bolted by explicit config.
> Question to community: would such change (especially if also of default
> behavior) be beneficial?
> 
> Jim
> 
> On Sat, Jun 4, 2022, 19:16 Selva Nair via Nut-upsuser <
> nut-upsuser at alioth-lists.debian.net> wrote:
> 
> > Ubuntu 22.04
> > NUT 2.7.4
> > CYberPower CP1500AVRLCDa  using usbhid-ups
> >
> > Hello,
> >
> > The above combination works well for a few minutes -- including shutdown on
> > pulling power or on upsmon -c fsd, notifications etc. Until the driver
> > starts reporting error in libusb_get_string, kernel messages on
> > USDEVFS_CONTROL failures and upsmon logs 'Data stale'
> >
> > It seems the UPS does not support interrupt transfer (or is buggy). On
> > adding pollonly=enabled to ups.conf, everything appears to be working
> > fine again.
> >
> > Is this a known issue? I have seen a number of success reports on this
> > model, none mentioning the need for pollonly, so wondering whether I
> > should troubleshoot this further.
> >
> > Thanks,
> >
> > Selva
> >
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