On Wed, 11 Apr 2012, Reartes Guillermo wrote: > Alan, > > Thanks for the quick answer. > > >> Messages: > >> XXXX kernel: [ 6027.939013] usb 2-1.1: reset high-speed USB device > >> number 7 using ehci_hcd > >> > >> When that happens, all said bridges do disconnect and reset. > >> They came back and remain functional. But sometimes with certain effects. > >> > >> Like when (04fc:0c25) was disconnected and reset. it came back, but > >> the touchpad became sloppy and some false keypresses happened. Reset > > > > What touchpad? Does your DVD drive have a touchpad? > > No, of course :-) > It did affect my laptop's touchpad (choppy movement) and keyboard (key > pressed on their own) until i rebooted. > > >> was required. Problem > > What sort of reset? The log message above indicates that the device > > had just been reset; why did it need another reset? > > The growisofs error: > :-[ WRITE@LBA=0h failed with SK=3h/POWER CALIBRATION AREA ERROR]: > Input/output error > happens with such writer attached directly to a sata controller, so it > is definitivelly not usb related. > > I believe that when such error happens with said writer attached to > such USB-SATA bridges (or maybe others) sometimes > the bridge disconnects, resets ans return, instead of giving the same > error again without disconnecting. Yes, probably the bridge doesn't know how to handle that kind of error. > Or maybe there is another > error/event/issue that causes the disconnection and reset. I am not > saying that the reset is wrong, but i am investigating why those > bridges are being disconnecting. > > > If you want to track this down, you should collect a usbmon trace. > > Read the instructions in Documentation/usb/usbmon.txt. > > I Captured them when that happened (using the port to where the bridge > were plugged) > > # cat /sys/kernel/debug/usb/usbmon/2u > ~/file.out > > Two of them are prety big, 3mb (compressed) and one not so much. > should i upload them somewhere or attach them here? If you can find a good place, upload them. 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
