From: not@telling.you.invalid   
      
   Lawrence D'Oliveiro  wrote:   
   > As far as I know, that adapter is completely dumb, knows nothing of "USB-   
   > PD" or any such, so it should just be putting out 5V through the power   
   > pins and that's it. Says it's rated for 2A. But the new phone doesn't want   
   > to look at that.   
   >   
   > Any thoughts on what might be going wrong? Not enough current, perhaps?   
      
   Surely you've answered your own question. The phone wants to chat   
   with the charger and it's not talking, so it's not happy.   
   Officially USB devices were supposed to negotiate with the host   
   and get permission before using >100mA. Since nobody paid   
   attention to that, dumb chargers ended up working anyway. I guess   
   the new USB-PD programmers are taking the standards more seriously.   
      
   The higher-rated dumb chargers (such as your 2A one) might also put   
   a resistor between the data lines to indicate that devices can pull   
   more current than the USB spec allows. Again it's up to the phone   
   designers whether they include the ability to check for that. You'd   
   hope they'd try to be backwards-compatible, but apparantly not.   
      
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