On 1/17/23 14:48, MC_Sequoia wrote: ...snip...
So, in conclusion I think the "MaxPower" data point provided by lsusb command is about the bus electrical output capacity that the device is connected to and not about the device itself that's connected to the usb bus.
This is not true, at least not for a USB device (not a hub). The MaxPower descriptor contains the maximum current that the device will ever draw. Properly designed USB devices first come up in a low power state where they draw 100 mA or less. The software driving the USB system calculates how much power is available. If there is sufficient power available, then the system initializes the device and allows it to go to its desired higher power state.
galen -- Galen Seitz gal...@seitzassoc.com
