On Mon, 29 Nov 2004, Greg KH wrote:

> On Mon, Nov 29, 2004 at 11:36:03PM +0100, Christian Axelsson wrote:
> > Hi!
> > 
> > Im trying to attach a usb2 200gb drive to my laptop that is runnig 
> > 2.6.10-rc2-mm3. Upon connect I get this in dmesg:
> 
> Hm, so 2.6.10-rc2 works for you?
> 
> >   usb 1-2: new high speed USB device using ehci_hcd and address 4
> >   scsi0 : SCSI emulation for USB Mass Storage devices
> >   usb-storage: device found at 4
> >   usb-storage: waiting for device to settle before scanning
> >     Vendor: Maxtor 6  Model: Y200P0            Rev: YAR4
> >     Type:   Direct-Access                      ANSI SCSI revision: 04
> >   SCSI device sda: 398297088 512-byte hdwr sectors (203928 MB)
> >   sda: assuming drive cache: write through
> >    sda: sda1
> >   Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
> >   Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0,  type 0
> 
> That looks good.
> 
> > Then I try to access the disk (via fdisk or mount anything) and I get 
> > the following in dmesg:
> > 
> >   usb 1-2: reset high speed USB device using ehci_hcd and address 4
> >   usb 1-2: scsi_eh_0 timed out on ep0in
> 
> Ick, not good.
> 
> I'll leave the rest of the logs below, for the linux-usb-devel people to
> potentually help out.
> 
> Oh, have you tried the ub driver instead?  Does that work for this
> device?
> 
> >   usb 1-2: device descriptor read/64, error -110
> >   usb 1-2: scsi_eh_0 timed out on ep0in
> >   usb 1-2: device descriptor read/64, error -110
> >   usb 1-2: reset high speed USB device using ehci_hcd and address 4
> >   usb 1-2: scsi_eh_0 timed out on ep0in
> >   usb 1-2: device descriptor read/64, error -110
> > 
> > Then it stalls a while and this shows up:
> > 
> >   scsi: Device offlined - not ready after error recovery: host 0 
> > channel 0 id 0 lun 0
> >   usb 1-2: USB disconnect, address 4
> >   scsi0 (0:0): rejecting I/O to offline device
> >   scsi0 (0:0): rejecting I/O to offline device
> >   usb-storage: device scan complete
> >   usb 1-2: new high speed USB device using ehci_hcd and address 5
> >   usb 1-2: khubd timed out on ep0in
> >   usb 1-2: device descriptor read/64, error -110
> > 
> > And repeats this.. I think you get the point ;)
> > The process trying to access the disk hangs.
> > Note: the drive works flawless under windows and has worked fine under 
> > linux during various stages of the 2.5 and early 2.6 kernels :)

To get more information about what's happening, turn on the usb-storage 
verbose debugging option in the kernel configuration.

Alan Stern



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