Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761808AbXIMPVX (ORCPT ); Thu, 13 Sep 2007 11:21:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757095AbXIMPVL (ORCPT ); Thu, 13 Sep 2007 11:21:11 -0400 Received: from rtr.ca ([76.10.145.34]:1390 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756335AbXIMPVJ (ORCPT ); Thu, 13 Sep 2007 11:21:09 -0400 Message-ID: <46E95563.5020704@rtr.ca> Date: Thu, 13 Sep 2007 11:21:07 -0400 From: Mark Lord User-Agent: Thunderbird 2.0.0.6 (X11/20070728) MIME-Version: 1.0 To: Alan Stern Cc: Chuck Ebbert , Niels , linux-kernel@vger.kernel.org, linux-scsi , USB development list Subject: Re: [linux-usb-devel] Problems with USB disk [solved] References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1761 Lines: 42 Alan Stern wrote: > On Thu, 13 Sep 2007, Mark Lord wrote: .. >> What happens is, there's a nice little LED on the Cruzer stick, >> that is "lit" when the stick itself is not in a "power suspend" state >> (or whatever you USB folks call it). > > We call it "suspended". (Wasn't there an episode of Classic Trek where > Mr. Spock explained to somebody, "I call them `ears'."?) > >> On 2.6.22, that little LED stays "on" normally, and flickers off/on >> when data is being transfered. >> >> The new "USB autosuspend" logic in 2.6.23 now causes that little LED >> to turn off after a few seconds of inactivity. >> >> Once that happens, the USB stick is not accessible until after a longish >> timeout (~30s I think), followed by a USB reset. Then it is usable again >> until the next inactivity timeout and autosuspend (a few seconds). > > So this _isn't_ the regression described above -- to wit, that the > drive gets spun down and then won't work without first being spun back > up. You wrote: > >>>> My Sandisk Cruzer Micro 1GB USB sticks suffer from this regression. > > But it doesn't. It suffers from a different regression. Perhaps, but that doesn't necessarily follow from the above. >From this observer's point of view (and being an expert on disk technologies), the same "spin up" issue for rotating media could be the culprit here too. A reset to a disk drive usually (not always) causes it to spin up. Regardless, Greg has acknowledged the regression and is planning to revert things. Cheers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/