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A comment on Apple rumored to subvert EU Rules by nerfing USB-C on iPhone15. Parent comment

Re:Apple rumored to subvert EU Rules by nerfing USB-C on iPh... by JustSomeNobody on Wednesday March 01, 2023 @03:46PM (#34988089)
> While a quality charger shouldn't try to push 60W or even 100W down an unsuitable cable, I've seen it happen.

How is this even possible?

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Re:Apple rumored to subvert EU Rules by nerfing USB-C on iPh... by LorenPechtel on Wednesday March 01, 2023 @04:16PM (#34988465)
Cheap cables may not implement the detection properly. Device says I want 100W, charger says I can give 100W, dumb cable just sits there letting them talk and doesn't say no.
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Re:Apple rumored to subvert EU Rules by nerfing USB-C on iPh... by error503 on Wednesday March 01, 2023 @07:09PM (#34990194)
What you describe would be a broken charger, not a broken cable.

The charger is supposed to interrogate the cable and only offer 5A if a) the cable responds and b) responds with a 5A capability.

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Re:Apple rumored to subvert EU Rules by nerfing USB-C on iPh... by LorenPechtel on Thursday March 02, 2023 @01:24PM (#34999621)
That's what's *supposed to* happen, but some of the bad cables omit that and the charger is actually talking to the device, not the cable.
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Re:Apple rumored to subvert EU Rules by nerfing USB-C on iPh... by error503 on Thursday March 02, 2023 @04:07PM (#35002091)
Huh? That's not how the PD protocol works, it's a multidrop bus, and the device won't respond to requests addressed to the cable.
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