Quick edit for archives: sudo modprobe i2c)bcn2708 baudrate=90000 should be sudo modprobe i2c_bcm2708 baudrate=90000
I tried changing the baud rate with
sudo modprobe -r i2c_bcm2708 sudo modprobe i2c)bcn2708 baudrate=90000 but it works fine at the default 100000.