Thanks @DavidF, looks like you got something there.
I plugged the DK30CHHPDEU at 50% battery and it was working fine : devices available and laptop was charging
When I came back the laptop was at 90% charge and it was disconnecting once again.
Which documentation did you review about this laptop that did not mention the Power Delivery ?
The laptop spec page on Dell website indicates : 1 USB 3.2 Gen 2 Type-C™ (DP/PowerDelivery)
It is strange that usb-c power is detected and can charge the laptop at low battery if it does not support Power Delivery, isn’t it ?
Thanks again for helping with this, looks like we’re getting close to understanding the issue here.
Regards.