Hi Alen/Peter , I do get the following error while the system is up and running . Basically the USB device get disconnected . Any insight into the problem ? [160549.977172] hub 2-1:1.0: state 7 ports 6 chg 0000 evt 0010^M [160549.977275] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 1^M [160549.977400] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 2^M [160549.977524] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 3^M [160549.977528] hub 2-1:1.0: port 4, status 0100, change 0001, 12 Mb/s^M [160549.977650] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 4^M [160549.977652] usb 2-1.4: USB disconnect, address 3^M [160549.977654] usb 2-1.4: unregistering device^M [160549.977656] usb 2-1.4: unregistering interface 2-1.4:1.0^M [160549.977772] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 5^M [160549.977897] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 6^M [160549.978020] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 7^M [160549.978146] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 8^M [160549.978269] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 9^M [160549.978394] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 10^M [160549.978519] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 11^M [160549.978644] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 12^M [160549.978770] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 13^M [160549.978894] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 14^M [160549.979018] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 15^M [160549.979144] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 16^M [160549.979269] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 17^M [160549.979393] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 18^M [160549.979517] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 19^M [160549.979642] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 20^M [160549.979768] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 21^M [160549.979892] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 22^M [160549.980016] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 23^M [160549.980142] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 24^M [160549.980266] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 25^M [160549.980391] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 26^M [160549.980516] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry 27^M Regards, Shaiju. -----Original Message----- From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] Sent: Sunday, July 29, 2012 2:54 PM To: shaiju shaiju Cc: 'Sadasivan Shaiju'; 'Peter Chen'; 'USB list' Subject: RE: usb device getting disconnected and connect back again. On Sun, 29 Jul 2012, shaiju shaiju wrote: > Hi Alen, > > This error is intermittent . It doesn't happen always . Then there may not be any way to determine the cause. Perhaps the firmware in the USB device intermittently crashes. Alan Stern -- 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
