Resolving Kernel Extension Driver conflicts on the Mac

The most common conflicting driver for the ChronoVu device is the FTDI VCP or Virtual Com Port driver, although some other device drivers, particularly drivers for hardware based upon FTDI USB interface chips, can also conflict with the ChronoVu device. Should such a conflict occur, open a Mac terminal window and enter the comand:


This should give a list of all currently active kernel extensions. Look through the list for a non-apple serial driver. A typical example would be:


Once you find the name of the driver to disable, enter the command:

sudo kextunload -b com.FTDI.driver.FTDIUSBSerialDriver

using, of course, the name from your list of active drivers. This command will temporarily disable the driver until the next time it is loaded by the system (typically on the next reboot). Once the conflicting driver has been disabled, plug in the ChronoVu device and open the ChronoVu software application. Go to the Help menu and select Change PID. Select the ChronoVu PID, click OK, and unplug the LA8. You may now restart the conflicting driver by entering the command:

sudo kextload -b com.FTDI.driver.FTDIUSBSerialDriver

(again substituting the name of the actual driver). After the driver has been restarted, plug in the (now modified) ChronoVu device. The driver conflict should be resolved.