On 11/16/13 22:17, Peter Jeremy wrote:
07:34:26.147358 usbus4.2 
DONE-BULK-EP=00000002,SPD=HIGH,NFR=1,SLEN=0,IVAL=0,ERR=0
07:34:26.147420 usbus4.2 SUBM-BULK-EP=00000002,SPD=HIGH,NFR=1,SLEN=20480,IVAL=0
07:35:29.624720 usbus4.2 
DONE-BULK-EP=00000002,SPD=HIGH,NFR=0,SLEN=0,IVAL=0,ERR=TIMEOUT
07:35:29.624742 usbus4.2 SUBM-CTRL-EP=00000000,SPD=HIGH,NFR=1,SLEN=8,IVAL=0


Hi,

You possibly need a HW USB analyzer to go further with this. If you can prove that the device is infinitly NAK'ing the USB transfer, which I think it is, not receiving the data it should, then it's a device fault, which is not that uncommon. Some devices don't handle stress simply. Else there are some known issues on the host side. See:

hw.usb.ehci.lostintrbug

For example.

--HPS

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