On Wed, Mar 19, 2014 at 12:37:37PM +0100, Andreas Reis wrote: > I've uploaded a dmesg with the new debugging patch to bugzilla: > https://bugzilla.kernel.org/attachment.cgi?id=130041 > > Andreas Reis > > On 18.03.2014 15:57, Alan Stern wrote:> > > The debugging information didn't go far enough. Try the patch below > > instead, which has some additional messages. > > > > There are two apparently separate problems here. First, why was the > > reset necessary? As far as I can tell, the only explanation seems to > > be a failure of Link Power Management. > > > > Second, why the errors in queuecommand_lck? I suspect the answer to > > that lies somewhere in the SCSI subystem, not USB. The new debugging > > patch should tell us for sure. Mathias, you might want to come up with a patch to disable link PM and see if it helps in this case. That could be as simple as not setting XHCI_INTEL_HOST for this PCI device ID, or could be as complex as exposing a sysfs file similar to usb2_hardware_lpm. It could also have something to do with how we set the U1/U2 timeouts for this particular device. Exposing a file to play with those settings may be interesting. I'll let you handle triaging the xHCI bug reports, but please let me know if you get stuck. Sarah Sharp -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
