On 21/06/2020 20:45, Folderol wrote:
> On Sun, 21 Jun 2020 18:40:59 +0100
> Chris Green  wrote:
>
>> Dennis Lee Bieber  wrote:
>>> On Sun, 21 Jun 2020 13:43:44 +0200, Deloptes  declaimed
>>> the following:
>>>
>>>>
>>>> OK, now I understand. It might depend on the cables, because as mentioned
>>>> recent USB2 cables (mainly provided with phone chargers) are capable of
>>>> caring the load (2A*5V=10W)
>>>>
>>>
>>>          And do those cables also provide data transfer? I've had a few
cell
>>> phones that came with power-only USB-2 cables -- no data pins. {And
>>> strangely, one of those would NOT charge using a common USB-2 charger [vs
>>> phone dedicated charger] but WOULD charge when plugged into a laptop at
>>> work... and I don't think the laptop had those special "charge mode" USB
>>> ports)
>>>
>> Yes, if you look into it the USB 'standard' is quite complicated
>> in that cables can be 'power only' and in that case there may be
>> resistors across pins to indicate this to the devices at the ends.
>>
>> This is only for 'old fashioned' mini- or micro-B cables, USB C is a
>> whole new ball game, much more complex.
>>
> Indeed. A good example of how *not* to develop a protocol. Define a poor
> standard to start, without a clear upgrade path, then keep piling on
> complexity :(
>
Not everything is about systemd. Its just that poettering wishes it was.

--
“Progress is precisely that which rules and regulations did not foresee,”

  – Ludwig von Mises

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