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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 3A91FC433E2 for ; Tue, 1 Sep 2020 16:36:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 227B920767 for ; Tue, 1 Sep 2020 16:36:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730709AbgIAQgE (ORCPT ); Tue, 1 Sep 2020 12:36:04 -0400 Received: from netrider.rowland.org ([192.131.102.5]:48699 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1731539AbgIAQgD (ORCPT ); Tue, 1 Sep 2020 12:36:03 -0400 Received: (qmail 592735 invoked by uid 1000); 1 Sep 2020 12:36:02 -0400 Date: Tue, 1 Sep 2020 12:36:02 -0400 From: Alan Stern To: Khalid Aziz Cc: gregkh@linuxfoundation.org, erkka.talvitie@vincit.fi, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC RESEND PATCH 0/1] USB EHCI: repeated resets on full and low speed devices Message-ID: <20200901163602.GG587030@rowland.harvard.edu> References: <20200901023117.GD571008@rowland.harvard.edu> <608418fa-b0ce-c2a4-ad79-fe505c842587@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <608418fa-b0ce-c2a4-ad79-fe505c842587@oracle.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Tue, Sep 01, 2020 at 09:15:46AM -0700, Khalid Aziz wrote: > On 8/31/20 8:31 PM, Alan Stern wrote: > > Can you collect a usbmon trace showing an example of this problem? > > > > I have attached usbmon traces for when USB hub with keyboards and mouse > is plugged into USB 2.0 port and when it is plugged into the NEC USB 3.0 > port. The usbmon traces show lots of errors, but no Clear-TT events. The large number of errors suggests that you've got a hardware problem; either a bad hub or bad USB connections. Alan Stern