From: Mark Lord Subject: Re: Problems with USB disk [solved] Date: Thu, 13 Sep 2007 11:21:07 -0400 Message-ID: <46E95563.5020704@rtr.ca> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-usb-devel-bounces@lists.sourceforge.net Errors-To: linux-usb-devel-bounces@lists.sourceforge.net To: Alan Stern Cc: Niels , USB development list , linux-kernel@vger.kernel.org, Chuck Ebbert , linux-scsi List-Id: linux-scsi@vger.kernel.org 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 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel