[Nut-upsuser] USB/UPS connectivity issue on Intel DP55KG Motherboard

Justin Piszcz jpiszcz at lucidpixels.com
Mon Oct 26 11:52:27 UTC 2009

On Thu, 15 Oct 2009, Justin Piszcz wrote:

> On Thu, 15 Oct 2009, Charles Lepple wrote:
>> On Oct 13, 2009, at 5:55 PM, Justin Piszcz wrote:
>>> Hello,
>>> I use the following in my ups.conf:
>>> # USB:
>>> [apc]
>>> driver = usbhid-ups
>>> port = auto
>>> desc = "APC 1500VA"
>>> pollfreq = 5
>> On NUT 2.4.1 (and some older versions), the pollfreq value determines how 
>> often usbhid-ups explicitly requests all of the values; however, the UPS is 
>> still free to send interrupt reports at any time within that polling 
>> interval, and those reports should be processed more frequently.
> Ah..
>> Typically, interrupt reports are sent by the UPS when status conditions 
>> change, so the reporting delay for something like a power failure should be 
>> well below pollfreq.
> Ok..
>> Was there a particular issue that led you to choose "5" for pollfreq? If 
>> so, what version of NUT were you using at the time?
> Yes, I wanted to be able to see power alerts / events when they were short.
> When pollfreq is not set, or if it is set too high (e.g. 30 seconds), I do
> not get any e-mail if the power goes out and then comes back on very quickly.
> Ok, so is this a bug with the USB chipset used on this DP55KG board or is it 
> a problem with nut?  OR did yet another change occur in the kernel usb 
> driver, I recall before I had to enable a specific option for other problems 
> I used to have on a different UPS 1-2 years ago.
> Justin.


I tried removing it, the problem persists, is there anything else I can 
try?  It would be nice to control my UPS in Linux.


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