On Jan 10, 2015, at 11:07 AM, Steve Ballantyne <[email protected]> wrote:
> On Thu, Jan 8, 2015 at 11:37 PM, Charles Lepple <[email protected]> wrote: >> Although this tends to happen more with x86 systems and/or USB3, you might >> want to see if the disconnects are less frequent with a shorter or >> higher-quality USB cable. > > The more I look into this ... the more I think that it's exclusively > Tripp-Lite weirdness! There are some things that I explored as far as > this being a Raspberry Pi problem, or a Raspbian problem, or even a > Debian problem. But any problems I could find out there have long > since been resolved with confirmed bug fixes. I forgot to mention, sometimes there are additional clues in the dmesg output that might point to cable issues-- but I am not holding my breath, since the RPi USB interface is somewhat different than UHCI or OHCI. > I noticed there have been a few people over the years on the NUT list > that have other models of Tripp Lite and have had this same issue of > random disconnections. So long as Tripp-Lite is not sharing their > code with us, I think this will remain a mystery. At some point they > are going to *have* to either update their Linux binaries, or drop > them altogether. The specific distributions that they support with > their proprietary software is loooong out of date. Perhaps at that > point they will open source the code? It can't hurt to ask. There have been a few references to other people with more than just one or two Tripp Lite UPSes deployed somewhere (e.g. Minutekey) so it might be worth pointing that out to a Tripp Lite sales rep as a potential distinguishing factor (especially now that Eaton has ended back their open source support). > Also there seems to be some speculation (or perhaps you know for a > fact) that the Tripp Lite actually includes a serial to USB converter > inside of the device. I have a stockpile of these awaiting > deployment. Maybe I will open one and look inside. Just speculation on my part, given the similarities between the serial protocol, and the non-HID USB messages. The converter might actually be absorbed into a microcontroller (that could share code with the serial-only microcontrollers), but I haven't cracked the case on my UPS to check. -- Charles Lepple clepple@gmail _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsuser
