Public bug reported:
I've just bought an FTDI based USB Serial converter (ID 0403:6001 Future
Technology Devices International, Ltd 8-bit FIFO).
Messages from dmesg at the time when the device is connected:
[20462.016000] usb 2-1: new full speed USB device using uhci_hcd and address 11
[20462.268000] usb 2-1: configuration #1 chosen from 1 choice
[20462.268000] ftdi_sio 2-1:1.0: FTDI USB Serial Device converter detected
[20462.268000] drivers/usb/serial/ftdi_sio.c: Detected FT232BM
[20462.268000] usb 2-1: FTDI USB Serial Device converter now attached to ttyUSB0
>From the beginning this device disconnected directly after it had been
connected. I solved that problem by installing the brltty package. After
this fix, however, the device device would instead disconnect after
several minutes.
After the device had been automatically disconnected by software, dmesg would
show the following error messages:
[19513.820000] drivers/usb/serial/ftdi_sio.c: error from flowcontrol urb
[19513.820000] drivers/usb/serial/ftdi_sio.c: update_mctrl Error from
MODEM_CTRL urb: DTR LOW, RTS LOW
I've been looking for a solution to this problem, but so far the best choice i
know of is to unload the ehci-hcd module (sudo rmmod ehci-hcd). I'm not sure if
this really is a workaround for this problem, and i don't know what other
problems it may cause, but the device has not yet disconnected again after i
unloaded this module.
/Hans
** Affects: Ubuntu
Importance: Undecided
Status: New
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FTDI USB Serial Device converter disconnects
https://bugs.launchpad.net/bugs/122834
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