linux-kernel - Re: Qualcomm Atheros QCA61x4 keeps drawing 0.85 W despite Bluetooth being disable in GNOME

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Date:   Sun, 19 Nov 2023 10:43:32 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: Qualcomm Atheros QCA61x4 keeps drawing 0.85 W despite Bluetooth
 being disable in GNOME

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
> ```