[gentoo-user] ftdi_sio disconnecting immediately

[Grant Edwards]

I'm having a peculiar problem with ftdi_sio.  With one particular
device, on one particular computer, the ftdi_sio driver always
disconnects immedately (5-10ms) after connecting:


[  368.917946] usb 1-7: new high-speed USB device number 8 using xhci_hcd
[  369.070822] usb 1-7: New USB device found, idVendor=0403, idProduct=6014, bcdDevice= 9.00
[  369.070826] usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  369.070829] usb 1-7: Product: Digilent USB Device
[  369.070831] usb 1-7: Manufacturer: Digilent
[  369.070833] usb 1-7: SerialNumber: 210244467841
[  369.086395] ftdi_sio 1-7:1.0: FTDI USB Serial Device converter detected
[  369.086434] usb 1-7: Detected FT232H
[  369.097053] usb 1-7: FTDI USB Serial Device converter now attached to ttyUSB0
[  369.102820] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[  369.102838] ftdi_sio 1-7:1.0: device disconnected

Note that the USB subsystem is happy: the device is still connected to
the USB bus, and it will remain connected at the USB level until I
disconnect the cable:

 # lsusb
 ...
 Bus 001 Device 008: ID 0403:6014 Future Technology Devices International, Ltd FT232H Single HS USB-UART/FIFO IC
 ...

Other FTDI devices work fine on this machine. The Digilent device
above works fine on other Gentoo machines with the same kernel
version.

Any ideas on how to determine why the ftdi_sio driver is disconnecting?

--
Grant