MSGID: <10cjha0$2ddhg$1@dont-email.me> 043e2858   
   REPLY: <10cjd8f$2c6rh$2@dont-email.me> 10067778   
   PID: PyGate 1.0   
   TID: PyGate/Linux 1.0   
   CHRS: ASCII 1   
   TZUTC: 0100   
   REPLYADDR usenet.16@scottsonline.org.uk.invalid   
   REPLYTO 3:633/10 UUCP   
   On 13/10/2025 18:35, Chris Townley wrote:   
   > On 13/10/2025 18:32, Chris Townley wrote:   
   >> On 13/10/2025 18:20, Pancho wrote:   
   >>> On 10/12/25 16:03, Daniel James wrote:   
   >>>> On 09/10/2025 16:42, Mike Scott wrote:   
   >>>>> I've just installed rasp OS on a new pi5 for the first time. It    
   >>>>> moans the psu is insufficient, and can't deliver 5A. But the psu    
   >>>>> itself - a kosher raspberry pi one - claims it will deliver 5A/25W.   
   >>>>   
   >>>> That doesn't sound right.   
   >>>>   
   >>>> Raspberry Pi sell three different USB-C PSUs:   
   >>>>   
   >>>> - A 15W PSU for use with the Pi 4/400 only.   
   >>>> - A 27W PSU for use with the Pi5/500 (and 4/400)   
   >>>> - A 45W PSU which is like the 27W but more powerful and can power    
   >>>> some laptops, etc.   
   >>>>   
   >>>> The 27W and 45W PSUs support the USB Power Delivery spec and will    
   >>>> provide a range of powers/voltages after negotiation with the    
   >>>> device. The 15W PSU provides only 5V/3A, and is stated to be    
   >>>> inadequate for the Pi5 and later.   
   >>>>   
   >>>> There is no official "kosher" 25W PSU from Raspberry Pi.   
   >>>>   
   >>>   
   >>> I think the 27W PSU was the original official version.   
   >>>   
   >>> Also, it is worth making clear the rPi5 USB PD is unusual, it only    
   >>> uses 5V and negotiates current up to 5A (which somehow = 27W).   
   >>>   
   >>>   
   >>> Whereas my normal USB PD plugs produce their specified high wattage    
   >>> by boosting voltage, so they don't work with the rpi5 at all. Which    
   >>> irritated me a lot when I found out.   
   >>   
   >> ISTR it can give other voltages, but the Pi5 will only negotiate 5V -    
   >> or 5.1V I believe   
   >    
   >  From the spec: The available profiles are 9V, 3A; 12V, 2.25A; and 15V,    
   > 1.8A, all limited to a maximum of 27W   
   > See https://www.raspberrypi.com/products/27w-power-supply/   
   >    
   >    
      
   (OP) That seems to be what I pi-hut delivered. So why the pi5 is    
   moaning, I can't think. 5.1V/5A, 9V/3A, 12V/2.25A, 15V/1.5A printed o0n it.   
      
   (I've moved back to a pi4 for the moment: there seems a problem in the    
   latest rasp OS on the pi5 that stops perl/Tk working correctly. Needs    
   checking out.)   
      
      
      
      
   --    
   Mike Scott   
   Harlow, England   
      
   --- PyGate Linux v1.0   
    * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)   
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