Am 02.03.2017 um 10:21 schrieb Colin Law:
> Running a LinkUSB on a pi zero (Raspbian Jessie), with owserver
> 3.1p4-1 from jessie testing, I very occasionally (every few weeks) see
> in syslog
>
> Mar 1 22:10:50 pi004 kernel: [194834.694657] ftdi_sio ttyUSB0: failed
> to get modem status: -110
> Mar 1 22:11:00 pi004 kernel: [194844.694679] ftdi_sio ttyUSB0: failed
> to get modem status: -110
> Mar 1 22:11:06 pi004 kernel: [194850.694734] ftdi_sio ttyUSB0:
> ftdi_set_termios FAILED to set databits/stopbits/parity
> Mar 1 22:11:07 pi004 kernel: [194851.694724] ftdi_sio ttyUSB0:
> ftdi_set_termios urb failed to set baudrate
> Mar 1 22:11:12 pi004 kernel: [194856.694771] ftdi_sio ttyUSB0: urb
> failed to clear flow control
> Mar 1 22:11:22 pi004 kernel: [194866.694810] ftdi_sio ttyUSB0: failed
> to get modem status: -110
> Mar 1 22:11:27 pi004 kernel: [194871.694819] ftdi_sio ttyUSB0: urb
> failed to clear flow control
>
These are messages from the ftdi_sio USB driver. All this usually means
the kernel simply cannot talk to the USB converter. Please check your
kernel log for USB related messages.
Kind regards
Jan
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