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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 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 8F040C433E0 for ; Tue, 26 May 2020 08:47:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E5C52075F for ; Tue, 26 May 2020 08:47:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731579AbgEZIrh (ORCPT ); Tue, 26 May 2020 04:47:37 -0400 Received: from mx2.suse.de ([195.135.220.15]:42186 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725771AbgEZIrg (ORCPT ); Tue, 26 May 2020 04:47:36 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 7E4E6AF36; Tue, 26 May 2020 08:47:38 +0000 (UTC) Message-ID: <1590482853.2838.26.camel@suse.com> Subject: Re: ttyACM: disabled by hub (EMI?), re-enabling... Causes garbage chars & disconnect From: Oliver Neukum To: Joakim Tjernlund , "linux-usb@vger.kernel.org" Date: Tue, 26 May 2020 10:47:33 +0200 In-Reply-To: References: <6a4fe396ab5ae6cda548e904c57bc823103999d7.camel@infinera.com> <1590418977.2838.16.camel@suse.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Am Montag, den 25.05.2020, 16:49 +0000 schrieb Joakim Tjernlund: > To be clear, I can pull the cable and put it back and there are no garbage chars. > There is also this error: > [Wed May 20 14:03:25 2020] cdc_acm 1-6.3:1.1: acm_ctrl_irq - usb_submit_urb failed: -19 > [Wed May 20 14:03:25 2020] usb 1-6-port2: attempt power cycle > [Wed May 20 14:03:26 2020] usb 1-6.3: USB disconnect, device number 86 > [Wed May 20 14:03:26 2020] cdc_acm 1-6.3:1.1: failed to set dtr/rts > > Should not this auto reenable emulate reattaching the USB cable? Hi, yes it should. You find the garage characters after the EMI event. How sure are you that they arrive after the event and not during the event? Regards Oliver