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