Messages in this thread | | | Date | Thu, 13 Sep 2007 10:35:46 -0400 | From | Mark Lord <> | 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.
- 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/
| |