From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933347AbeB1VEK (ORCPT ); Wed, 28 Feb 2018 16:04:10 -0500 Received: from helium.openadk.org ([89.238.66.15]:42661 "EHLO helium.openadk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932790AbeB1VEJ (ORCPT ); Wed, 28 Feb 2018 16:04:09 -0500 Date: Wed, 28 Feb 2018 21:54:44 +0100 From: Waldemar Brodkorb To: linux-kernel@vger.kernel.org Subject: xhci: Not enough bandwidth for new device state Message-ID: <20180228205444.GX12535@waldemar-brodkorb.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Operating-System: Linux 3.16.0-5-amd64 x86_64 User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I am getting these messages from a Debian 9.3 system using Linux 4.9.x: [ 547.352746] usb 3-5.2: 3:1: usb_set_interface failed (-28) [ 548.352865] usb 3-5.3: Not enough bandwidth for new device state. [ 548.352868] usb 3-5.3: Not enough bandwidth for altsetting 1 I have connected a 7-Port USB 3.0 Hub to my machine. I have 6 different Headsets and USB Soundcards connected to the HUB. As soon as I start a C++ application which opens all ALSA devices I get these errors and the USB stopps working correctly. I think the maximum count of USB sound devices, which behave stable is three or four. Is this some miscalculation of the Linux kernel regarding the USB bandwidth usage? How I can determine how much bandwidth the USB sound card driver preallocates? Or are five USB soundcards really too much for an USB 3.0 bus? Thanks in advance for any advise, best regards Waldemar