can,t read rplidar data on rasberry pi.

edit

i am using rasberry pi 2 model B.i want to do slam with rplidar and i have done it by connecting rplidar with pc but when i did same thing by connecting lidar with rasberry pi its rotation speed became too slow and it is not showing scan data in rplidar sdk on rasberry pi.I used ubuntu mate in pi. Maybe it is power issue. laptop usb port current rating is 400 to 500 mA ,and one solution i found on this website is that to increase current rating from 0.6 to 1.2 ampere by max_usb_current=1 in /boot/config.txt .. But i think this current will damage the lidar as it is more than lidar power requirement. can any body help me please? Thanks in advance...