Re: [PATCH] Bluetooth: btusb: Add a module parameter ignore_id for debugging

[Hui Wang <hui.wang@canonical.com>]

On 2020/8/2 下午10:58, Marcel Holtmann wrote:
> Hi Hui,
>
>> There is always an on-board usb bluetooth hci on the laptops, if
>> the bluetooth function doesn't work well like a bt headset can't work
>> with HSP/HFP mode, we often plug an external usb BT hci to verify if
>> that headset could work with the exteral BT hci or not, in this
>> situation, there will be 2 hcis (hci0 and hci1) in the system, and
>> so far, the gnome can't handle the hci1 well so we met lots of
>> problems when debugging with hci1 under gnome.
>>
>> After adding this new module parameter, we could ban the on-board
>> usb hci by putting btusb.ignore_id=idVendor,idProduct to the bootargs,
>> then the external usb hci will be hci0 and there is only one hci
>> in the system. We could easily debug with the external usb bluetooth
>> hci after this change.
>>
>> Signed-off-by: Hui Wang <hui.wang@canonical.com>
>> ---
>> drivers/bluetooth/btusb.c | 11 +++++++++++
>> 1 file changed, 11 insertions(+)
> please use this instead.
>
> echo “vvvv pppp 0 08fd 0002" > /sys/bus/usb/drivers/foo/new_id

Thanks,  but to run the command above,  the system should boot up 
first.  After the system boot up, the btusb is already loaded and and 
the on-board hci is already driven by btusb. looks like it is too late 
to run that command for on-board hci.

Thanks,

Hui.

>
> Regards
>
> Marcel
>