Finally got myself an official Pi 5 power supply, so hopefully the thing won't just randomly die under load any more.
Raspberry Pi Foundation love making videos about their "not invented here" approach to power supplies, but guys, you actually suck at it and your continued inability to implement USB C Power Delivery (and PoE) sensibly is getting fucking old.
Sarah Brown
in reply to Sarah Brown • •"I want 27 watts!"
"This is a laptop PSU. It'll do well over a hundred."
"No! Useless! I die now! Starved of power!"
Fucksake.
like this
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Kincaid
in reply to Sarah Brown • • •i have taken to wiring 5.something volts to the 5V and ground pins for project stuff
That works but not so useful for 'desktop' stuff
Riley S. Faelan
in reply to Sarah Brown • • •USB C has this annoying rule that the downstream has to ask for power before the upstream provides anything above 100mA.
The workaround that I used with RPi4 was, I'd use some noname Chinese 3A USB 2 charger — USB 2 doesn't really know or care about this particular rule, the cheap chargers just provide 5V at whatever amperage they can put out — and an USB A <–> USB C cable to connect that 5V 3A to the RPi.
Because of the recent developments at the Raspberry Foundation, I don't think I'll be getting any RPi5:s, so I can't test it myself, but I think odds are good that this approach still works.
Sarah Brown
in reply to Riley S. Faelan • •The 5 has the opposite problem. It wants 5 volts at 27 watts, and exactly that, or no USB power for you!
If you go the pi 4 route of “dumb”
PSUs, it’ll massively throttle itself and refuse to boot from USB
joshie 🏳️🌈
in reply to Sarah Brown • • •oooohhh but if we implement USB-PD and use anything >5V then we would have to add another voltage regulation stage and ooooohhh woe is me
i understand their "lets not add cost for a feature only 2% of users might actually want" philiosphy, but yeah no fuck off pi foundation. power delivery is not one of those things worth saving 12 cents a board on
Sarah Brown
in reply to joshie 🏳️🌈 • •@joshie 🏳️🌈 Particularly because it ONLY works with their PSU. It will boot up massively degraded from anything else, but at less capability than a Pi 4 (like, it will disable USB boot and if you force enable it, it will randomly die from lack of power).
And don't get me started on the PoE hats that scream and function as heaters when the pi shuts down.