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+--- Thread: NetBSD 1.0 runs down battery (/showthread.php?tid=18864)
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RE: NetBSD 1.0 runs down battery - donn - 11-15-2023
I don't expect the cable knows anything! It's just wires and terminals. I don't know right off hand why it wouldn't have a direct power connection, like the AC adapter power supply that supplies the same 5V.
RE: NetBSD 1.0 runs down battery - KC9UDX - 11-15-2023
(11-15-2023, 12:39 PM)donn Wrote: I don't expect the cable knows anything! It's just wires and terminals. I don't know right off hand why it wouldn't have a direct power connection, like the AC adapter power supply that supplies the same 5V.
Some cables actually have chips in the plug ends. USB-C charging is capable of negotiating charge rates, and that must happen (if it does) in the cable or the wall wart that the cable plugs in to. The PBP does *not* negotiate USB-C charging rates in hardware. I don't know if Linux might tell a smart charger plugged in to USB to turn on. But such a device, if that's what's happening, should generate a message when NetBSD does or doesn't recognise it, I expect.
RE: NetBSD 1.0 runs down battery - donn - 11-15-2023
Ah, I see written on the AC adapter to USB A, DC 5.0V=3A / DC 9V=2A / DC 12V=1.5A
RE: NetBSD 1.0 runs down battery - KC9UDX - 11-15-2023
Just to be clear, that feature does greatly speed up charging on devices* that support it, but the PBP does not support it. Even if Linux is negotiating with the adaptor somehow, there's no actual benefit (other than maybe a power supply that needs to be commanded to turn on, such as what might be happening above).
*not in that case, as the current is lower at higher voltages, so no power gain