From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752761Ab3ABNlE (ORCPT ); Wed, 2 Jan 2013 08:41:04 -0500 Received: from ironport2-out.teksavvy.com ([206.248.154.182]:64641 "EHLO ironport2-out.teksavvy.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752656Ab3ABNlD (ORCPT ); Wed, 2 Jan 2013 08:41:03 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AtsGAG6Zu08Y1OVO/2dsb2JhbABEgXuyFoEIghUBAQU4HgYSCgEQCwsNCRYPCQMCAQIBERYeBgoDAQcCh3sBDQGnXogCChmBC4h7iwiFPAOIQoIWikOFT4ohgweBQQ X-IronPort-AV: E=Sophos;i="4.75,637,1330923600"; d="scan'208";a="211190683" Message-ID: <50E438F7.7040403@gmail.com> Date: Wed, 02 Jan 2013 08:41:11 -0500 From: Woody Suwalski User-Agent: Mozilla/5.0 (X11; Linux i686; rv:18.0) Gecko/20100101 Firefox/18.0 SeaMonkey/2.15 MIME-Version: 1.0 To: Greg Kroah-Hartman CC: Linus Torvalds , USB list , Linux Kernel Mailing List Subject: Re: Linux 3.8-rc1 - another regression on USB :-( References: <50D764BA.1030501@gmail.com> <20121223232748.GA23804@kroah.com> In-Reply-To: <20121223232748.GA23804@kroah.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Greg Kroah-Hartman wrote: > On Sun, Dec 23, 2012 at 02:35:49PM -0800, Linus Torvalds wrote: >> Woody, >> Any chance you can bisect this? It's not going to be hugely pleasant >> (with 11k+ commits in between 3.7 and 3.8-rc1 you'll have to compile >> and test at least 14 kernels), but it would help enormously. Of >> course, maybe some USB person can guess what would cause the device to >> go offline.. >> >> Added Greg and the linux-usb mailing list to the participants list: >> the images are in the original email on lkml, but there isn't anything >> particularly interesting there, it really just seems to be an >> unexpected and spurious USB disconnect, resulting in "USB disconnect, >> device number 2" followed by "Rejecting I/O to offline device". > I don't see any images on lkml, sorry. > > The kernel log for when the disconnect happened would be great to get. > > The kernel can't cause a device to disconnect, that's an electrical > thing usually, is this perchance a flaky device/connection? Or has it > always worked on older kernels? > > What host controller is being used here (xhci, ehci, etc.?) > > thanks, > > greg k-h Greg, Linus, It sounds insane, but after banging on the issue I have found out that USB problem is caused (also in vanilla kernel) with a config change: USB-all built as modules - bad USB USB core built in, UHCI/EHCI modules - semi functional - but 1Mb/s transfer USB core and UHCI EHCI built-in - bingo - no issues. Could anybody duplicate that, or is it somehow my setup??? Thanks, Woody