[Nut-upsuser] Install problems (group permissions) with nut 2.7.2

Charles Lepple clepple at gmail.com
Sat Feb 21 00:49:35 UTC 2015

On Feb 20, 2015, at 3:15 PM, Rob Groner <rgroner at RTD.com> wrote:

> Instead, it seems that the usbhid-ups driver will search through its own list of known devices with vid/pid, and won't "match" my device unless that device exists as an entry in its device table.  Is that correct?

More or less, yes.

It turns out that UPS vendors all have somewhat different interpretations of the PDC spec.

There was an idea to create a generic fallback driver that could talk to any USB HID PDC device:


But at the moment, when we suggest passing the 'productid = ' parameter to usbhid-ups, it is because there is already a set of tables for that vendor, and their model is not all that different from earlier models. 

The nutdrv_qx driver might be more flexible in this regard, since we tend to see different VID:PID combinations for devices that all speak one of several easily identifiable dialects of the Megatec Q* protocols.

- Charles Lepple
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