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SubjectRe: Qualcomm Atheros QCA61x4 keeps drawing 0.85 W despite Bluetooth being disable in GNOME
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Dear Alan,


Thank you for your reply.

Am 21.11.23 um 17:23 schrieb Alan Stern:
> On Mon, Nov 20, 2023 at 11:05:04PM +0100, Paul Menzel wrote:
>> [Cc: +Rocky Liao as Qualcomm developer]
>
>> Am 20.11.23 um 19:10 schrieb Alan Stern:
>>> Again, nothing out of the ordinary. Maybe dynamic debugging will give
>>> us a clue. Try doing this:
>>>
>>> Unload the btusb module.
>>>
>>> echo module usbcore +p >/sys/kernel/debug/dynamic_debug/control
>>>
>>> Load the btusb module
>>>
>>> Make sure that Bluetooth is turned off in Gnome
>>>
>>> Wait a few seconds
>>>
>>> echo module usbcore -p >/sys/kernel/debug/dynamic_debug/control
>>>
>>> Then let's see what the dmesg log contains for that time period.
>>
>> ```
>> $ sudo modprobe -r btusb
>> $ sudo dmesg | tail -1
>> [340309.272439] usbcore: deregistering interface driver btusb
>> $ echo module usbcore +p | sudo tee /sys/kernel/debug/dynamic_debug/control
>> module usbcore +p
>> $ sudo modprobe btusb
>> $ /sbin/rfkill
>> ID TYPE DEVICE SOFT HARD
>> 1 wlan phy0 unblocked unblocked
>> 36 bluetooth hci0 blocked unblocked
>> $ echo module usbcore -p | sudo tee /sys/kernel/debug/dynamic_debug/control
>> module usbcore -p
>> $ sudo modprobe -r btusb
>> $ sudo dmesg | tail -1
>> [340608.761313] usbcore: deregistering interface driver btusb
>> $ sudo dmesg
>> […]
>> [340309.272439] usbcore: deregistering interface driver btusb
>> [340560.326182] xhci_hcd 0000:00:14.0: hcd_pci_runtime_resume: 0
>> [340560.326214] usb usb1: usb auto-resume
>> [340560.326258] hub 1-0:1.0: hub_resume
>> [340560.326381] usb usb1-port3: status 0107 change 0000
>> [340560.326418] usb usb1-port4: status 0107 change 0000
>> [340560.326451] usb usb1-port5: status 0507 change 0000
>> [340560.326650] hub 1-0:1.0: state 7 ports 12 chg 0000 evt 0000
>> [340560.326807] hub 1-0:1.0: state 7 ports 12 chg 0000 evt 0000
>> [340560.373988] usb 1-3: usb auto-resume
>> [340560.373998] hub 1-0:1.0: state 7 ports 12 chg 0000 evt 0008
>> [340560.441936] usb 1-3: Waited 0ms for CONNECT
>> [340560.441957] usb 1-3: finish reset-resume
>> [340560.570940] usb 1-3: reset full-speed USB device number 2 using xhci_hcd
>
> Those two lines are unexpected. Why does the device need to be reset?
> While the btusb module is loaded, does anything show up in
> /sys/bus/usb/devices/1-3/quirks?

$ more /sys/bus/usb/devices/1-3/quirks
0x2

>>> Also, please post the output from "lsusb -v" for the Bluetooth device.
>>
>> ```
>> $ sudo lsusb -d 0cf3:e300 -v
>>
>> Bus 001 Device 002: ID 0cf3:e300 Qualcomm Atheros Communications QCA61x4
>> Bluetooth 4.0
>> Device Descriptor:
>> bLength 18
>> bDescriptorType 1
>> bcdUSB 2.01
>> bDeviceClass 224 Wireless
>> bDeviceSubClass 1 Radio Frequency
>> bDeviceProtocol 1 Bluetooth
>> bMaxPacketSize0 64
>> idVendor 0x0cf3 Qualcomm Atheros Communications
>> idProduct 0xe300 QCA61x4 Bluetooth 4.0
>> bcdDevice 0.01
>> iManufacturer 0
>> iProduct 0
>> iSerial 0
>> bNumConfigurations 1
>> Configuration Descriptor:
>> bLength 9
>> bDescriptorType 2
>> wTotalLength 0x00b1
>> bNumInterfaces 2
>> bConfigurationValue 1
>> iConfiguration 0
>> bmAttributes 0xe0
>> Self Powered
>> Remote Wakeup
>
> That's what I was interested in. The device does support remote wakeup.

That would make sense so it can be resumed? (It does not necessarily
mean something like Wake-On-LAN, right?

Also, for this device it’s disabled?

$ grep . /sys/bus/usb/devices/1-3/power/wakeup
disabled

>> PPS: Looking through the commit log/history for `drivers/bluetooth/btusb.c`,
>> I found commit 7ecacafc2406 (Bluetooth: btusb: Disable runtime suspend on
>> Realtek devices) [1] authored on December 5th, 2019. This is for Realtek
>> devices though, and not Qualcomm.
>
> Furthermore the driver has changed considerably since 2019. See
> commits 8274db0776d1, 895915226a59, 7bd9fb058d77, and 34ec58b9fd1c.

Thank you for the references.


Kind regards,

Paul

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