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[79.185.227.154]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-53e377f3ba3sm1082152e87.187.2024.12.09.14.03.29 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 09 Dec 2024 14:03:30 -0800 (PST) Date: Mon, 9 Dec 2024 23:03:25 +0100 From: =?UTF-8?B?TWljaGHFgg==?= Pecio To: chkr@plauener.de Cc: linux-usb@vger.kernel.org Subject: Re: Different speed of USB control transfers for HS USB devices depending on used USB port Message-ID: <20241209230325.5a683364@foxbook> In-Reply-To: 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 Hi, I see obvious pattern that the bad ports are bus 001 and the good port is bus 003, and they are two different chips. Do you see similar correlation with chip types on other motherboards? You can see the mapping between bus numbers and controllers using ls -l /sys/bus/usb/devices/usb* Generally, with xHCI it's on the controller to packetize and schedule such transfers, so this is likey a hardware problem. Regards, Michal