Ok, so, on the affected expansion ports:
- When the laptop is running:
- having an empty USB-A adapter plugged in does draw extra power, because the redriver (retimer?) doesn’t sleep right
- having a USB-A adapter with any kind of USB-device connected also draws power, but only as much as one would expect from a USB-device being active?
- empty USB-C adapters do not draw extra power
- USB-C adapters with any kind of USB-device connected also draw power, but only as much as one would expect from a USB-device being active
- When the laptop is in suspend mode:
- having an empty USB-A adapter plugged in still does draws extra power, because the USB4 redrivers (retimers?) screw up even when they should be sleeping
(ok, to be fair, there is this whole “wake computer by pressing key on USB keyboard” nonsense that might require USB-ports to be at least half-awake) - having a USB3 device connected via USB-A adapter does not draw extra power (according to [RESPONDED] AMD Batch 1 Guild - #123 by Zachary_Burnett)
- having a USB2 device connected via USB-A adapter does draw extra power
- what about USB1.2 ? (still relevant for input devices, I think?)
- why does it make a difference if it’s a USB2 vs USB3 device?
- empty USB-C adapters still don’t draw extra power (of course)
- Any kind of USB-device (USB1 - USB4) connected through a USB-C adapter presumably does not draw extra power
- having an empty USB-A adapter plugged in still does draws extra power, because the USB4 redrivers (retimers?) screw up even when they should be sleeping
(I hope I’m not being too annoying, I just want to understand wtf is going on exactly :))