Am Donnerstag, dem 23.03.2023 um 14:53 +0100 schrieb Oliver Neukum: > > On 23.03.23 13:52, Michael Laß wrote: > > > > Yes, the remote device is programmed to print "Hello World" every > > three > > seconds. Nothing should have stopped it from doing that. > > I am asking because the device says that it is bus powered. > That is, are we putting the device into some sleep state? This got me thinking. I am observing the behavior on a ZedBoard, a development board that contains a Xilinx Zynq SoC and the Cypress UART chip connected to that SoC. I now looked into the schematic of that board. The chip is a CY7C64225-28PVXC and the datasheet has a section on USB suspend and resume: When suspended, a separate WAKE input pin has to be set high to issue a remote wake-up. The designers of the ZedBoard have tied this pin to ground... So the chip behaves as documented. If any, this is an issue with the board design. Nothing the kernel could work around. Sorry, I hope I haven't stolen too much of your time. Kind regards, Michael
