On Sun, Nov 19, 2023 at 02:42:58PM +0100, Paul Menzel wrote: > [Fix typo in subject line] > > Dear Linux folks, > > > On the Dell XPS 13 9360 from 2016, BIOS 2.21.0 06/02/2022, with Debian > sid/unstable and Debian’s Linux 6.5.10 kernel, I am trying to extend the > run-time with battery, at under 50 % of it’s original capacity, and I am > using PowerTOP 2.15. > Although radio/wireless devices are turned off in GNOME, PowerTOP shows the > Bluetooth device drawing 0.85 W of energy: > > 848 mW 100.0% Device USB device: usb-device-0cf3-e300 > > $ lsusb -d 0cf3:e300 > Bus 001 Device 002: ID 0cf3:e300 Qualcomm Atheros Communications QCA61x4 > Bluetooth 4.0 > After unloading the module `btusb`, the entry disappears from the PowerTOP > list after a while. > > usbcore: deregistering interface driver btusb > > Auto-suspend was enabled for the device. (Though it shouldn’t have mattered > as it was disabled in GNOME?) Enabling autosuspend means that the device _may_ go into runtime suspend when it's not being used. Whether it _will_ do so depends on the driver (btusb in this case). > Anyways, have you heard of such an issue? Can I provide more information, to > get it to not use any energy while being disable in GNOME? What is the output from grep . /sys/bus/usb/devices/1-3/power/* both with and without the btusb module loaded? Alan Stern > $ lsusb -t > /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 10000M > |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 10000M > |__ Port 2: Dev 3, If 0, Class=Vendor Specific Class, Driver=r8152, > 5000M > /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M > |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M > |__ Port 1: Dev 3, If 0, Class=Human Interface Device, > Driver=usbhid, 12M > /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M > |__ Port 3: Dev 2, If 0, Class=Wireless, Driver=, 12M > |__ Port 3: Dev 2, If 1, Class=Wireless, Driver=, 12M > |__ Port 4: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, > 12M > |__ Port 5: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M > |__ Port 5: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M > ```
