Re: System hangs when using USB 3.0 HD with on Ubuntu

[Sarah Sharp <sarah.a.sharp@linux.intel.com>]

On Fri, Apr 02, 2010 at 10:12:35AM -0400, Alan Stern wrote:
> On Fri, 2 Apr 2010, Jonas Schwertfeger wrote:
> 
> > Actually, you hit the nail on the head Kay. I moved the hdparm rule
> > out of the way and voilà, the drive mounts. I then manually ran hdparm
> > on the device:
> > 
> > sudo hdparm --verbose /dev/sdb
> > 
> > /dev/sdb:
> > outgoing cdb:  85 08 2e 00 00 00 00 00 00 00 00 00 00 40 ec 00
> > SG_IO: ATA_16 status=0x0, host_status=0x7, driver_status=0x0
> > SG_IO: bad response (not CHECK_CONDITION)
> > outgoing cdb:  85 08 2e 00 00 00 00 00 00 00 00 00 00 40 a1 00
> > SG_IO: ATA_16 status=0x0, host_status=0x7, driver_status=0x0
> > SG_IO: bad response (not CHECK_CONDITION)
> >  HDIO_DRIVE_CMD(identify) failed: Invalid exchange
> >  readonly      =  0 (off)
> >  readahead     = 256 (on)
> >  geometry      = 36365/64/32, sectors = 0, start = 0
> > 
> > Does the command sent by hdparm look familiar? Exactly, it is the
> > third ATA command (IDENTIFY DEVICE) we discovered earlier and caused
> > the drive to stall.
> 
> That's nice to know.  Other people have been reporting similar 
> problems.  Now we can tell where they come from.
> 
> > Does anyone know why the drive would not be able to cope with this
> > command?
> 
> No idea.  Except that it's probably not the drive's fault, but rather 
> the fault of the USB-(S)ATA chip that controls the drive.
> 
> > And also, why does it not choke on it in USB 2.0 mode but
> > only in USB 3.0?
> 
> That's easy: It chokes in USB-2.0 mode also.  But the ehci-hcd
> driver is able to reset the drive and recover, whereas xhci-hcd has not 
> yet implemented reset.  Hence no recovery is possible.

The xhci-hcd driver in 2.6.32 doesn't support configured device reset,
but it was added in 2.6.33.  So an update to a later kernel should allow
the device to work in USB 3.0 mode.

Sarah Sharp