Device not recognised with lsusb

Sven Klomp sven at
Tue Mar 17 18:36:04 CET 2009


I have a strange behaviour if I attach my self-made USB device to the Freerunner. The device is recognized 
correctly as cdc-acm as dmesg shows:

[ 8405.545000] usb 1-2: new full speed USB device using s3c2410-ohci and address 18
[ 8405.740000] usb 1-2: config 1 has an invalid descriptor of length 161, skipping remainder of the config
[ 8405.745000] usb 1-2: configuration #1 chosen from 1 choice
[ 8405.755000] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[ 8405.775000] usb 1-2: New USB device found, idVendor=1781, idProduct=0c64

Furthermore, I can correctly send data with echo "test" > /dev/ttyACM0

However, lsusb doesn't show the device:
Bus 001 Device 001: ID 1d6b:0001

If I try with an USB stick, lsusb gives the expected output. And I don't have this problem if I connect the 
device to my computer...

Has someone a hint for me?


More information about the devel mailing list