linux-kernel - Re: [linux-usb-devel] Problems with USB disk [solved]

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Date:	Thu, 13 Sep 2007 10:35:46 -0400
From:	Mark Lord <lkml@....ca>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	Niels <zorglub_olsen@...mail.com>, linux-kernel@...r.kernel.org,
	linux-scsi <linux-scsi@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] Problems with USB disk [solved]

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.

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