linux-kernel - Re: Strange problem with USB device

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Message-ID: <960057be-ef17-49e7-adba-ba2929d3a01f@lwfinger.net>
Date:   Tue, 8 Jun 2021 15:56:11 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        ierturk@...e.org
Subject: Re: Strange problem with USB device

On 6/8/21 1:53 PM, Alan Stern wrote:
> I don't get it.  If this is a PCIe device, why should it appear
> on a USB bus?  Wouldn't you expect it to show up as a PCI device
> on a PCI bus instead?
> 

I do not know the internal details, but Realtek packages a PCIe wifi device and 
a bluetooth USB device in the same package. Intel does the same thing on my 
Wireless 7260.

My lsusb shows:
Bus 003 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 8087:07dc Intel Corp. Bluetooth wireless interface
Bus 002 Device 003: ID 0bda:c822 Realtek Semiconductor Corp. Bluetooth Radio
Bus 002 Device 002: ID 04f2:b3b2 Chicony Electronics Co., Ltd TOSHIBA Web Camera 
- FHD
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I have no devices plugged into a USB port.

Larry