Since receiving my AMD Framework 13, I’ve tried using various chargers and I’ve had issues with some of them, namely:
- USB-C2 port of “Sharge Storm2” power bank (up to 15V 2A)
- Steam Deck charger “Chicony W20-045N1B” (up to 20V 2.25A)
With both of them, the laptop reports to be charging and stops charging immediately.
Compared to other laptops/devices (which ramp up their current slowly after requesting the charging voltage), the Framework seems to pull a lot of current during the voltage ramp-up of the PD source (it seems to pull 3A during the entire 5V->15V/20V ramp).
This seems to upset at least some PD sources, possibly because their current limit is already set to the lower one (2A / 2.25A) during voltage ramp-up, while the Framework is still pulling 3A throughout.
Today, I’ve had access to a proper USB-C PD analyzer and I could take a closer look:
This was the Framework connected to the Steam Deck charger. The PSU first turns on with 5V, after a few milliseconds the Framework starts drawing 3A (which is fine on 5V), then requests the maximum of 20V 2.25A the charger supports, and then (with some weird pauses) keeps drawing 3A during the voltage ramp up until the PSU shuts off somewhere around 11V, possibly due to its overcurrent protection.
The same test with the Storm2 power bank looks similar, except with some voltage oscillation during ramp-up until the power bank shuts off.
EC / PD Controller firmware is the one provided with the current BIOS 3.03 (EC 66fc8, PD Controller 0.0.1C).