On Sun, Nov 19, 2023 at 11:09:32PM +0100, Paul Menzel wrote: > $ sudo modprobe btusb > $ grep . /sys/bus/usb/devices/1-3/power/* > /sys/bus/usb/devices/1-3/power/active_duration:119053224 > /sys/bus/usb/devices/1-3/power/async:enabled > /sys/bus/usb/devices/1-3/power/autosuspend:2 > /sys/bus/usb/devices/1-3/power/autosuspend_delay_ms:2000 > /sys/bus/usb/devices/1-3/power/connected_duration:148065372 > /sys/bus/usb/devices/1-3/power/control:auto > /sys/bus/usb/devices/1-3/power/level:auto > /sys/bus/usb/devices/1-3/power/persist:1 > /sys/bus/usb/devices/1-3/power/runtime_active_kids:0 > /sys/bus/usb/devices/1-3/power/runtime_active_time:119060567 > /sys/bus/usb/devices/1-3/power/runtime_enabled:enabled > /sys/bus/usb/devices/1-3/power/runtime_status:active > /sys/bus/usb/devices/1-3/power/runtime_suspended_time:28831453 > /sys/bus/usb/devices/1-3/power/runtime_usage:0 > /sys/bus/usb/devices/1-3/power/wakeup:disabled > ``` Hmmm. It's not immediately clear why the device isn't being suspended. The btusb driver does support autosuspend. Can you also post the output from grep . /sys/bus/usb/devices/1-3:*/power/* with the driver module loaded? I should have asked for it before. > ``` > $ sudo modprobe -r btusb > $ sudo dmesg | tail -1 > [314106.155163] usbcore: deregistering interface driver btusb > $ grep . /sys/bus/usb/devices/1-3/power/* > /sys/bus/usb/devices/1-3/power/active_duration:119072176 > /sys/bus/usb/devices/1-3/power/async:enabled > /sys/bus/usb/devices/1-3/power/autosuspend:2 > /sys/bus/usb/devices/1-3/power/autosuspend_delay_ms:2000 > /sys/bus/usb/devices/1-3/power/connected_duration:148320980 > /sys/bus/usb/devices/1-3/power/control:auto > /sys/bus/usb/devices/1-3/power/level:auto > /sys/bus/usb/devices/1-3/power/persist:1 > /sys/bus/usb/devices/1-3/power/runtime_active_kids:0 > /sys/bus/usb/devices/1-3/power/runtime_active_time:119079518 > /sys/bus/usb/devices/1-3/power/runtime_enabled:enabled > /sys/bus/usb/devices/1-3/power/runtime_status:suspended > /sys/bus/usb/devices/1-3/power/runtime_suspended_time:29068110 > /sys/bus/usb/devices/1-3/power/runtime_usage:0 > /sys/bus/usb/devices/1-3/power/wakeup:disabled > ``` Okay, and here we see that without the driver, the device does get suspended. Alan Stern
