I have the following two USB wireless mouse/keyboard receivers: logitech-djreceiver 0003:046D:C52B.0003: hiddev0,hidraw0: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:14.0-13/input2 hid-generic 0003:046D:C52E.0005: input,hidraw2: USB HID v1.11 Keyboard [Logitech USB Receiver] on usb-0000:00:14.0-14/input0 The default values in their power/wakeup: [tom@localhost ~]$ cat /sys/bus/usb/devices/3-13/power/wakeup disabled [tom@localhost ~]$ cat /sys/bus/usb/devices/3-14/power/wakeup enabled According to https://www.kernel.org/doc/Documentation/usb/power-management.txt: power/wakeup This file is empty if the device does not support remote wakeup. Otherwise the file contains either the word "enabled" or the word "disabled", ... My question is, which part of the kernel or system determines the default value? When I had a quick look on the source of the two driver modules, I couldn't find any code related. So what caused the difference? P.S. I have no udev rule related to power/wakeup, which is the case I am asking about. [tom@localhost ~]$ cd /etc/udev/rules.d/ [tom@localhost rules.d]$ grep wakeup * grep: *: No such file or directory [tom@localhost rules.d]$ cd /lib/udev/rules.d/ [tom@localhost rules.d]$ grep wakeup * 42-usb-hid-pm.rules:# advertise remote wakeup support but don't actually implement 42-usb-hid-pm.rules:# remote wakeup is working. -- 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
