Hello,

     I cannot reproduce this problem on my available hardware. For the 
working and non working case,
it would be interesting to know:
     - the linux distribution
     - the linux kernel version
     - if the system is 32 or 64 bits
     - the libusb version used

     When the LED doesn't switch on, does 'dmesg' show any usb related 
kernel message ?

Regards,
     Stef

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