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[24.31.245.230]) by smtp.gmail.com with ESMTPSA id q26sm3267711otn.0.2021.06.08.13.56.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Jun 2021 13:56:12 -0700 (PDT) Sender: Larry Finger Subject: Re: Strange problem with USB device To: Alan Stern Cc: linux-usb@vger.kernel.org, LKML , ierturk@ieee.org References: <20210608182038.GA1812516@rowland.harvard.edu> <20210608185314.GB1812516@rowland.harvard.edu> From: Larry Finger Message-ID: <960057be-ef17-49e7-adba-ba2929d3a01f@lwfinger.net> Date: Tue, 8 Jun 2021 15:56:11 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: <20210608185314.GB1812516@rowland.harvard.edu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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