On Tue, 14 Oct 2014, Cristian wrote: > Dear Alan Stern, > > Of [0] and [1]: > [0] https://launchpadlibrarian.net/187256631/CurrentDmesg.txt > [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380802 > > [0]: > [ 1014.961203] ch341-uart ttyUSB0: > usb_serial_generic_write_bulk_callback - nonzero urb status: -71 > [ 1014.961252] ch341-uart ttyUSB0: > usb_serial_generic_read_bulk_callback - nonzero urb status: -71 > [ 1014.961418] ch341-uart ttyUSB0: > usb_serial_generic_write_bulk_callback - nonzero urb status: -71 > [ 1014.961465] ch341-uart ttyUSB0: > usb_serial_generic_read_bulk_callback - nonzero urb status: -71 > [ 1014.961619] ch341-uart ttyUSB0: > usb_serial_generic_write_bulk_callback - nonzero urb status: -71 > [ 1014.961636] ch341-uart ttyUSB0: > usb_serial_generic_read_bulk_callback - nonzero urb status: -71 > [ 1014.961781] ch341-uart ttyUSB0: > usb_serial_generic_write_bulk_callback - nonzero urb status: -71 > [ 1014.961802] ch341-uart ttyUSB0: > usb_serial_generic_read_bulk_callback - nonzero urb status: -71 > [ 1014.962044] ch341-uart ttyUSB0: > usb_serial_generic_write_bulk_callback - nonzero urb status: -71 > [ 1014.962076] ch341-uart ttyUSB0: > usb_serial_generic_read_bulk_callback - nonzero urb status: -71 > [ 1014.962221] ch341-uart ttyUSB0: > usb_serial_generic_write_bulk_callback - nonzero urb status: -71 > [ 1014.962240] ch341-uart ttyUSB0: > usb_serial_generic_read_bulk_callback - nonzero urb status: -71 > [ 1014.962431] ch341-uart ttyUSB0: > usb_serial_generic_write_bulk_callback - nonzero urb status: -71 > > > 2014-10-14 11:01 GMT-03:00 Alan Stern <[email protected]>: > > On Tue, 14 Oct 2014, Cristian wrote: > > > >> Hello! > >> > >> The message appears when I'm printing and disconnect USB-Serial cable > > > > What message? > > > > Besides, shouldn't you expect some sort of error message to appear if > > you diconnect a USB cable while the computer is using it? > > One menssage, no many messages IMHO
There are many error messages because the USB serial driver maintains a queue of several data packets to transfer (so as to maximize throughput). Each packet in the queue causes an error message. This isn't a bug. Maybe you think it is overkill, but there's nothing really wrong with it. Besides, if you don't want those messages to appear then don't unplug the USB cable while you are printing! :-) Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
