I bought this UPS to use with NUT. I've used Belkin, APC, CyberPower, Best, Powerware upses with NUT on dozens of servers beginning with RHEL3.
http://www.amazon.com/Tripp-Lite-Display-Protection-SMART1500LCDT/dp/B009TZTGWK Since this was advertised as USB HID, I didn't expect any problems. Bad idea (should have gotten the Cyberware with somewhat less runtime). Initially, it seems to work with the NUT usbhid-ups driver. Here is the output of upsc: battery.charge: 100 battery.charge.low: 10 battery.charge.warning: 30 battery.runtime: 4718 battery.type: PbAC battery.voltage: 0.0 battery.voltage.nominal: 24.0 device.mfr: Tripp Lite device.model: TRIPP LITE UPS device.serial: 2546DVLSM871900329 device.type: ups driver.name: usbhid-ups driver.parameter.pollfreq: 30 driver.parameter.pollinterval: 2 driver.parameter.port: auto driver.parameter.productid: 3016 driver.parameter.vendorid: 09ae driver.version: 2.7.2 driver.version.data: TrippLite HID 0.81 driver.version.internal: 0.38 input.frequency: 6020.0 input.transfer.high: 150.0 input.transfer.low: 92.0 input.voltage: 0.0 input.voltage.nominal: 120 output.current: 130.00 output.frequency: 6020.0 output.frequency.nominal: 60 output.voltage: 0.0 output.voltage.nominal: 120 ups.beeper.status: enabled ups.delay.shutdown: 20 ups.delay.start: 30 ups.load: 10 ups.mfr: Tripp Lite ups.model: TRIPP LITE UPS ups.power: 90.0 ups.power.nominal: 1500 ups.productid: 3016 ups.serial: 2546DVLSM871900329 ups.status: OL ups.timer.reboot: 65535 ups.timer.shutdown: 65535 ups.timer.start: 65535 ups.vendorid: 09ae ups.watchdog.status: 0 On RHEL6 with nut-2.6.5, it runs for 1 or 2 days, then gets Plugging in new USB cable: May 16 21:01:07 fairfax kernel: usb 4-2: new low speed USB device number 17 using uhci_hcd May 16 21:01:07 fairfax kernel: usb 4-2: New USB device found, idVendor=09ae, idProduct=3016 May 16 21:01:07 fairfax kernel: usb 4-2: New USB device strings: Mfr=3,Product=1, SerialNumber=May 16 21:01:07 fairfax kernel: usb 4-2: Product: TRIPP LITE UPS May 16 21:01:07 fairfax kernel: usb 4-2: Manufacturer: Tripp Lite May 16 21:01:07 fairfax kernel: usb 4-2: SerialNumber: 2546DVLSM871900329 May 16 21:01:07 fairfax kernel: usb 4-2: configuration #1 chosen from 1choice May 16 21:01:07 fairfax kernel: generic-usb 0003:09AE:3016.0008: hiddev96,hidraw0: USB HID v1.11 Device [Tripp Lite TRIPP LITE UPS] on usb-0000:00:1d.2-2/input0 May 16 21:01:08 fairfax upsmon[10255]: Poll UPS [trippups@localhost] failed - Data stale May 16 21:01:08 fairfax upsd[10250]: UPS [trippups] data is no longer stale .... May 18 14:53:34 fairfax kernel: hub 4-0:1.0: port 2 disabled by hub (EMI?), re-enabling... May 18 14:53:34 fairfax kernel: usb 4-2: USB disconnect, device number 17 May 18 14:53:34 fairfax kernel: usb 4-2: new low speed USB device number 18 using uhci_hcd May 18 14:53:35 fairfax kernel: usb 4-2: new low speed USB device number 19 using uhci_hcd May 18 14:53:35 fairfax kernel: usb 4-2: new low speed USB device number 20 using uhci_hcd May 18 14:53:35 fairfax kernel: usb 4-2: device not accepting address 20, error -71 May 18 14:53:35 fairfax kernel: usb 4-2: new full speed USB device number 21 using uhci_hcd May 18 14:53:36 fairfax kernel: usb 4-2: device not accepting address 21, error -71 May 18 14:53:36 fairfax kernel: hub 4-0:1.0: unable to enumerate USB device on port 2 The UPS "falls off" the USB bus¸ and only physically replugging the USB cable seems to reset it. (I tried different cables and different ports, and even some hubs). So I plugged the cable into an old laptop with Fedora 19, and mocked up nut-2.7.2 from f23 for f19. That also runs initially, but in less than a minute gets an I/O error: upsdrvctl[3729]: Can't open /var/run/nut/usbhid-ups-auto.pid: No such file or di systemd[1]: nut-driver.service: main process exited, code=exited, status=1/FAILU upsd[3726]: Can't connect to UPS [trippups] (usbhid-ups-trippups): No such file upsd[3726]: Can't connect to UPS [trippups] (usbhid-ups-trippups): No such file usbhid-ups[3725]: Can't claim USB device [09ae:3016]: No such file or directory usbhid-ups[3725]: libusb_get_report: Input/output error upsd[3726]: Connected to UPS [trippups]: usbhid-ups-trippups upsd[3726]: listening on 127.0.0.1 port 3493 upsd[3726]: Connected to UPS [trippups]: usbhid-ups-trippups upsd[3726]: listening on 127.0.0.1 port 3493 upsd[3726]: listening on ::1 port 3493 upsd[3726]: listening on ::1 port 3493 upsd[3726]: listening on 2001:470:8:xxxx::xxxx port 3493 upsd[3726]: listening on 2001:470:8:xxxx::xxxx port 3493 upsd[3726]: fopen /var/run/nut/upsd.pid: No such file or directory usbhid-ups[3725]: Startup successful systemd[1]: Started Network UPS Tools - power devices information server. systemd[1]: Starting Network UPS Tools - power devices information server... I have a ticket open with TrippLite, but at this point it seems to be a software, rather than hardware problem, since with the newer kernel and usbhid-ups, the ups stays on the bus, and I could kludge around the problem by making systemd keep restarting nut-driver. They seem to be interested in actually resolving the issue. If necessary, I am willing to donate the TrippLite and just buy a Cyberware (the last cyberware I bought works - hopefully they haven't broken their USB code). What should I do next to diagnose this problem? I don't know enough about USB protocol to determine which side is broken (I can only point to all the other brands of USB UPC that work).
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