Hi,

I would like to ask for any ideas how to fix an issue on repeated USB Device Connection/Disconnection.

I am using Fedora Core 5, kernel 2.6.20. I plugged in a USB IR device but my Linux doesn't seem to drive the device. I tried displaying the "/var/log/messages", I found these messages:
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....
Apr 9 18:39:28 wf kernel: usb 4-2: new full speed USB device using uhci_hcd and address 33
Apr 9 18:39:28 wf kernel: usb 4-2: configuration #1 chosen from 1 choice
Apr 9 18:39:28 wf kernel: ftdi_sio 4-2:1.0: FTDI USB Serial Device converter detected
Apr 9 18:39:28 wf kernel: drivers/usb/serial/ftdi_sio.c: Detected FT232BM
Apr 9 18:39:28 wf kernel: usb 4-2: FTDI USB Serial Device converter now attached to ttyUSB0
Apr 9 18:39:28 wf kernel: usb 4-2: USB disconnect, address 33
Apr 9 18:39:28 wf kernel: ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
Apr 9 18:39:28 wf kernel: ftdi_sio 4-2:1.0: device disconnected
Apr 9 18:39:29 wf kernel: usb 4-2: new full speed USB device using uhci_hcd and address 34
Apr 9 18:39:29 wf kernel: usb 4-2: configuration #1 chosen from 1 choice
Apr 9 18:39:29 wf kernel: ftdi_sio 4-2:1.0: FTDI USB Serial Device converter detected
Apr 9 18:39:29 wf kernel: drivers/usb/serial/ftdi_sio.c: Detected FT232BM
Apr 9 18:39:29 wf kernel: usb 4-2: FTDI USB Serial Device converter now attached to ttyUSB0
Apr 9 18:39:29 wf kernel: usb 4-2: USB disconnect, address 34
Apr 9 18:39:29 wf kernel: ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
Apr 9 18:39:29 wf kernel: ftdi_sio 4-2:1.0: device disconnected
Apr 9 18:39:29 wf udevd-event[6902]: wait_for_sysfs: waiting for '/sys/devices/pci0000:00/0000:00:1d.1/usb4/4-2/4-2:1.0/bus' failed
......
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These messages keep on looping back from 2 to 127. Anyone knows how to fix this?

Thanks!

Hi,

Actually, the original kernel with my Fedora core is 2.6.15-1, I installed newer kernel versions 2.6.20-1, 2.6.20.3 and 2.6.20.6, hoping this would fix the problem, but unluckily, it didn't.

Any ideas?

Thanks,
jcaga

For those who would encounter the same issue, I emailed the support for the USB device and they adviced me to connect an externet power supply. I did and it worked!