On Sun, Aug 19, 2012 at 02:31:12PM +0000, Luke-Jr wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=46201 > > I have a device that uses a FTDI USB-to-serial chip identified by lsusb as: > Bus 001 Device 051: ID 0403:6014 Future Technology Devices International, Ltd > > Only recently, within 24 hours, it will error like this, at which point the > FTDI driver becomes unusable, even for other devices: > Aug 18 13:24:07 [kernel] ftdi_sio ttyUSB2: error from flowcontrol urb > Aug 18 13:24:12 [kernel] ftdi_sio ttyUSB2: ftdi_set_termios urb failed to set > baudrate > Aug 18 13:24:12 [kernel] ftdi_sio ttyUSB2: urb failed to clear flow control > - Last output repeated 379 times - > Aug 18 19:58:16 [kernel] ftdi_sio ttyUSB2: error from flowcontrol urb > > This has worked fine for months, even for a week after I upgraded to 3.4.4, so > there's probably some hardware trouble going on(?), but it probably shouldn't > mess up the driver like this. > > Also worth mentioning: the RMA replacement unit I have also exhibits this same > problem, but neither of them do if I connect the same devices to an old Ubuntu > netbook (2.6.32-41-generic). That's a big range of kernel releases between the working and non-working kernel. Is there any chance you can build your own kernel and test that? Try 3.0 and a binary search to see where things broke? It would really be good if you could use 'git bisect' to find the exact breakage point, if at all possible. thanks, greg k-h -- 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
