System -> System Administration -> Hardware Drivers.
Take a screenshot and post it here.
You could also try installing EnvyNG from the Software Center. It should be able to download and install the drivers for you. I have no idea if it's available on 10.10, though.
Take a screenshot and post it here.
You could also try installing EnvyNG from the Software Center. It should be able to download and install the drivers for you. I have no idea if it's available on 10.10, though.