Clinfo does not print anything (Ubuntu)

OpenCL will not work if your user is not part of the group Video.

Open a terminal window by pressing Ctrl + Alt + T keys on the keyboard, then add your user to group Video:

Restart your PC:

Open a terminal window by pressing Ctrl + Alt + T keys on the keyboard, then execute the following commands:

This will print all available information about all OpenCL platforms on the system and the devices they expose.

In case the number of platforms is equal to 0 you need to install the OpenCL driver.