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[2a01:c23:614a:dd00:ef5:1851:2e93:33e7]) by smtp.gmail.com with ESMTPSA id m21-20020a056000175500b0032326908972sm7570528wrf.17.2023.11.05.12.24.19 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Nov 2023 12:24:20 -0800 (PST) Date: Sun, 5 Nov 2023 21:24:19 +0100 From: Fabian Melzow To: linux-usb@vger.kernel.org Subject: Re: 0bda:b812 USB "3.0" WLAN devices only report a maximum of 480 Mbps Message-ID: <20231105210616.79fea846@ping> In-Reply-To: <7738cb40-9ef1-4e8e-8888-b8faadb7ba8a@rowland.harvard.edu> References: <20231105130215.2b669c8b@ping> <2023110540-unseemly-mobilize-9e82@gregkh> <20231105134909.6c3f28d1@ping> <2023110534-fester-schematic-818a@gregkh> <20231105143051.2b28c316@ping> <76fc65db-4efe-4da7-a13f-d7a451f836fa@rowland.harvard.edu> <20231105163300.3b8df5ad@ping> <7738cb40-9ef1-4e8e-8888-b8faadb7ba8a@rowland.harvard.edu> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Am Sun, 5 Nov 2023 14:16:18 -0500 schrieb Alan Stern : > On Sun, Nov 05, 2023 at 04:33:00PM +0100, Fabian Melzow wrote: > > Am Sun, 5 Nov 2023 09:56:06 -0500 > > schrieb Alan Stern : > > > How do you know that the device's USB hardware supports more than > > > 480 Mbps? And even if the hardware does, maybe the firmware > > > doesn't. > > > > > > (Note: Just because the device's WLAN interface can run at 780 > > > Mbps, it does not follow that the USB interface can run that > > > fast.) > > > > These USB WLAN sticks are sold as "USB 3.0", and also have a blue > > USB-3.0-A-plug. I don't really know the speed, but 480 Mbps is > > reported by "lsusb -t" or in the descriptor. I did not open these > > devices, but have assumed that they only use a single chip to > > handle everything, WLAN and USB. > > Have you tried plugging the device into a system running a different > OS (Windows or MacOS-X)? Or even a different Linux system? Yes, I also made a short test with the lsusb of an old Debian 11 Live-DVD. I got these devices for testing from the Amazon Vine program and after the third Monday-Hardware WLAN-device with the same problem I thought I should report this problem, to maybe help real users. (Forgot to send the mail also to this list.)