>> I'm still not sure how to interprete the comment "High-speed root hubs >> are an exception; they need to resume whenever the system wakes up in >> order for USB-PERSIST port handover to work properly". What is broken >> if we set skip_sys_resume regardless of the speed? >Then USB-PERSIST port handover won't work. If a full-speed device is attached to the computer, and the UHCI or OHCI host >controller gets reset or loses power during a system suspend, then during resume the kernel will believe that the device was >unplugged and then replugged. >If the device was a USB drive and it contained a mounted filesystem then the filesystem will become unusable. In the system that I'm currently working on, resuming EHCI whenever system wakes up is causing quite a bit current drain, which we are fighting to optimize. If we have only one high speed device connected to the EHCI through TLL interface (no transceiver or PHY in between), then it would be fine to skip system resume, right? Please advise. Thanks a lot, Fei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
