From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: [linux-usb-devel] Problems with USB disk [solved] Date: Thu, 13 Sep 2007 10:35:46 -0400 Message-ID: <46E94AC2.3030607@rtr.ca> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Alan Stern Cc: Chuck Ebbert , Niels , linux-kernel@vger.kernel.org, linux-scsi , USB development list List-Id: linux-scsi@vger.kernel.org Alan Stern wrote: > On Wed, 12 Sep 2007, Mark Lord wrote: > >> Chuck Ebbert wrote: .. >>> Oh, nice. The usb-storage (SCSI) disk spins itself down and we can't handle that. >>> Should we be disabling auto-spindown when we connect the device, or be able to >>> handle this by sending the start command when needed? >> There's more to this. >> >> My Sandisk Cruzer Micro 1GB USB sticks suffer from this regression. > > I seriously doubt that. Are you claiming that your USB stick spins > itself down during a suspend? And then requires to be spun back up > before it will resume proper operation? No, the machine is not being suspended at all. 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). 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). Etc.