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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 8B2B2C7618B for ; Tue, 23 Jul 2019 12:45:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5FD9621903 for ; Tue, 23 Jul 2019 12:45:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563885902; bh=ezXGuaPyEFYREjCYhTlxVrdBje5JuIzTolgw4Ncxxwk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=VWcowrRKlEq2uOMw0zFJvJsc0/O+rKJvUyAr2g9kocvlxTzbW3QQognx/NtFyoRLA BKTOA86scKnRN3em4hegjUnMofDjEtyKf+r38pTaEjNlO+TpB7Pv5r12f8sxbAdwEN Fvl3P3W73QuJzQ/Bby1qsU2KTyJ3kDHPfPHU1luU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387888AbfGWMpB (ORCPT ); Tue, 23 Jul 2019 08:45:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:54934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731264AbfGWMpA (ORCPT ); Tue, 23 Jul 2019 08:45:00 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1ECE621903; Tue, 23 Jul 2019 12:44:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563885899; bh=ezXGuaPyEFYREjCYhTlxVrdBje5JuIzTolgw4Ncxxwk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bg2uhVX4Vy8OUzLqnSPO895uU72v5XVTje6+ks+7reHyN10B/GOh6FfIy0cyBioCn PZ8IO9P46cmsrp758LKZ2o+AT+lKyHTjCk3HQ5bktEV9Me+KVMVlgEiIEMo2cuPhzL 0Kv4BaCtFS+LrJa8pYj2qtwLLBP+Sovi8Cfr7EQk= Date: Tue, 23 Jul 2019 14:44:57 +0200 From: Greg KH To: Frank Bergmann Cc: linux-usb@vger.kernel.org Subject: Re: High-Impact: xhci_hid - "Not enough bandwidth for new device state" Message-ID: <20190723124457.GB5356@kroah.com> References: <27f21154-659d-67b5-ac90-b931695614c8@project-open.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <27f21154-659d-67b5-ac90-b931695614c8@project-open.com> User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Tue, Jul 23, 2019 at 02:31:18PM +0200, Frank Bergmann wrote: > Dear Linux-USB, > > > https://bugzilla.redhat.com/show_bug.cgi?id=1411604 > > - This bug is around since 5 years. > > - Severity: High > > - "It's not Fedora specific, it's linux in general" > > > There are 671 results in Google for 'USB "Not enough bandwidth for new > device state"'. Why does nobody take this on? Because there's not much to be done here. You are trying to add a device to the USB bus that is asking for more bandwidth than the bus currently can provide. So we fail the device addition. What are we supposed to do instead? > > > I offer to send you or whoever a Logitech C922 WebCam if it accelerates the > process :-) > > > The bug basically keeps people from using a USB 3.0 WebCam in parallel to > some virtual machine Audio. This means it will affect any "professional" > users who need to do GoToMeeting or WebEx together with running a Windows > VM. Why do you say that? Many people have that configuration working just fine. Personally I have a ton of USB devices all plugged into one USB 3 port running at the same time (webcam, audio devices, keyboard, mouse) and video conferences work just fine with that. Try plugging the device into a separate USB root hub and you should be fine, as we can't do the impossible here (get extra bandwidth than what is present on the system). thanks, greg k-h