FWIW, a few lessons learned: * Different USB-A sized ports (even if marked USB-3.2) did not prove a stable source, with Pi5 occasionally turning off or rebooting. Sort of behaved well for days, but as soon as I added load like package installs or NUT builds, it did not survive 5 minutes...
* Might be the MoBo turning off or cycling the port due to "overload"?.. * Tried the `usb_resetter` script (referenced in NUT contribs) and host `dmesg` did show re-detection of keyboard etc., but a turned-off Pi did not boot up. Did not check much further, but did harbor hopes that a funny NUT driver could "shutdown/reboot" the USB port acting as an UPS for Pi... * The Pi power socket is dumb-USB so the host does not "see" any IDs about it. * Currently trying with a USB-C port on the MoBo, and a USB-C to USB-C cable rated for 60W -- and so far it survived a few loops of NUT fightwarn builds. Complains of undervoltage fairly frequently (every 30-60s), but now did not crash yet. Jim On Mon, Sep 16, 2024, 13:57 Greg Troxel via Nut-upsuser < [email protected]> wrote: > Kelly Byrd <[email protected]> writes: > > > With USB-C ports and cables, there are a ton of profiles, I don't know > what > > the new Pi's support, but likely something like 3A @ 5V, 9V, or 12V over > > USB-C > > Up to the RPI4, I was pretty sure there wasn't PD, just 5V and it drew > what it drew, and you hoped that the supply was big enough. > > It seems the RPI5 will use PD if given a capable supply. Looks like 5V > 5A, and it won't negotitate higher voltages. There's an official > supply that does PD > > > https://www.newark.com/raspberry-pi/sc1153/power-supply-usb-c-5-1v-5a-white/dp/82AK3955 > > and the output spec is > > 5A at 5.1V, 3A at 9V, 2.25A at 12V, 1.8A at 15V > > looks like a TUV seal > > > > I find Jim's way of using this interesting, but my approach is totally > different. First, when I'm using a Pi, it's because I want a low power > computer that I can leave on all the time, or can place in a different > physical location I don't particularly want to do things on a Pi instead > of a desktop. And then I want it to be reliable. > > That leads me to plug a power supply into a UPS, or to use POE (from a > POE switch which is plugged into a UPS). For RPI3, I found a POE > ejector that splits the POE ethernet cable into ethernet only and a > micro USB. > > > _______________________________________________ > Nut-upsuser mailing list > [email protected] > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser >
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