From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8131C4338F for ; Sun, 15 Aug 2021 06:28:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 796306103D for ; Sun, 15 Aug 2021 06:28:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231631AbhHOG3U (ORCPT ); Sun, 15 Aug 2021 02:29:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:43402 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231238AbhHOG3U (ORCPT ); Sun, 15 Aug 2021 02:29:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4D4F660240; Sun, 15 Aug 2021 06:28:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1629008930; bh=4eLOsiU/fu2gZ8/ZvV6U9dnO9AR+LfRmF46STH+JBYE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=10Ai4I/tYqWV4G7H67lR5aG528RPqPOcBivmJjOcdmPWVnnuIiv15blJOIDqGM9lv tXIIEVdvIgepifbWK3vlNec0dlt8EudrOGCZrxPMTEpG75Po6p121ifYdK93+ZcIGP XqKmQTBKAX5LuLE6VZ2bgbFpC8uEbOMZx08MnkKw= Date: Sun, 15 Aug 2021 08:28:48 +0200 From: Greg KH To: Eyal Lebedinsky Cc: linux-usb@vger.kernel.org Subject: Re: USB hub problem Message-ID: References: <3481f401-1d52-d5a1-d983-4b5f7046704b@eyal.emu.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3481f401-1d52-d5a1-d983-4b5f7046704b@eyal.emu.id.au> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Sun, Aug 15, 2021 at 09:32:06AM +1000, Eyal Lebedinsky wrote: > I have an external 4-way USB3.0 hub (I actually have two of them) That do not behave as expected. > It is an XCD XCDESSUSBH4BK. It is unpowered. I am on fedora 34, kernel 5.13.8-200.fc34.x86_64 > > For starters, I found that attaching a USB SSD does not allow booting from it. That is up to your BIOS, not Linux. > I then found that when attaching my phone it is not recognized. In what way? > I searched the hub model and IDs but did not find relevant information. > Is there an official list of supported hubs (or devices)? No, as any list would instantly be out of date. > Here is what it looks like. > > When the hub is attached (no phone) I see > Bus 001 Device 048: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub > and > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M > |__ Port 5: Dev 5, If 0, Class=Hub, Driver=hub/4p, 480M > |__ Port 2: Dev 48, If 0, Class=Hub, Driver=hub/4p, 480M > Attaching the phone does not add a device. > > Detaching/attaching the hub (with the phone already plugged in) I get > Bus 001 Device 052: ID 04e8:6860 Samsung Electronics Co., Ltd Galaxy A5 (MTP) > Bus 001 Device 051: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub > and > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M > |__ Port 5: Dev 5, If 0, Class=Hub, Driver=hub/4p, 480M > |__ Port 2: Dev 51, If 0, Class=Hub, Driver=hub/4p, 480M > |__ Port 1: Dev 52, If 1, Class=Communications, Driver=cdc_acm, 480M > |__ Port 1: Dev 52, If 2, Class=CDC Data, Driver=cdc_acm, 480M > |__ Port 1: Dev 52, If 0, Class=Imaging, Driver=, 480M > |__ Port 1: Dev 52, If 3, Class=Vendor Specific Class, Driver=, 480M > and the phone is recognized and accessible as MTP device. Great, so when does this not work? This shows a successful device found. thanks, greg k-h