title: USB connection trouble
body: <p>I am currently running a robotic's project using an Hokuyo (URG-04LX-UG01 - <a href="http://www.hokuyo-aut.jp/02sensor/07scanner/urg_04lx_ug01.html" rel="nofollow">http://www.hokuyo-aut.jp/02sensor/07scanner/urg_04lx_ug01.html</a>). This one is plugged to my computer using USB. Although it creates the port "/dev/ttyACM0" when I plug it, I can't connect to it using the associated library (serial connection error). Until here, nothing's strange, bugs or misprogramming happens but here is my problem :
  When I plug the hokuyo to an USB HUB, which is also plugged to my computer, I can connect to it and everything works perfectly.</p>
  
  <p>My laptop is a samsung 900x3c running Linux Mint 15.</p>
  
  <p>Do you know what an USB HUB changes in the USB communication ? 
  Is there a link with my laptop ? (I used to face the same problem using an ARM-Based embedded computer)
  Is it possible to fix the issue without using any hardware solution ?
  If it's not, is there anything more compact than an USB HUB which could fix it ?</p>
  
  <p>Thanks !</p>