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).
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