linux-kernel - Re: Strange problem with USB device

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Date:   Tue, 8 Jun 2021 19:57:12 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Larry Finger <Larry.Finger@...inger.net>
Cc:     linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        ierturk@...e.org
Subject: Re: Strange problem with USB device

On Tue, Jun 08, 2021 at 12:41:23PM -0500, Larry Finger wrote:
> Hi,
> 
> In https://bugzilla.suse.com/show_bug.cgi?id=1186889, a user is reporting
> that his Bluetooth component of a Realtek RTL8822CE is not being found in
> openSUSE's kernel 5.3.18. His lsusb scan is as follows:
> 
> $ lsusb
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 003: ID 13d3:56c9 IMC Networks HP TrueVision HD Camera
> Bus 001 Device 002: ID 045e:07fd Microsoft Corp. Nano Transceiver 1.1
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> The Bluetooth device is found and works in Windows 10, where the Device
> Manager reports hardware ID's of 0bda:b00c. This combination is in driver
> btusb.
> 
> Is there a bug in the USB bus scan in kernel 5.3.18 that has since been
> fixed, or is there still a bug that misses this device?

Loads of things have changed since 5.3.18, that was a long time ago :)

Are you sure this device doesn't need a "magic" command sent to it in
order for it to show up as a USB device on the bus?  That sometimes
happens :(

thanks,

greg k-h