Test your joystick with jstest

To test your controls, you can use the jstest command, which allows you to list information about your controls.

• You must first have root access via terminal

• To find out if your controls have been detected by the system, use the following command:

cat /proc/bus/input/devices

• After your controllers are detected, a special event is created for each of them in /dev/input, you can see them listing them with this command:

ls /dev/input/js*

• You can now start a special command to test your control's buttons and axes. For example, to test your first control on the system:

jstest /dev/input/js0

• You should get the following answer:

Driver version is 2.1.0.
Joystick (Logitech Logitech Cordless RumblePad 2)
has 6 axes (X, Y, Z, Rz, Hat0X, Hat0Y)
and 12 buttons (BtnX, BtnY, BtnZ, BtnTL, BtnTR, BtnTL2, BtnTR2, BtnSelect, BtnStart, BtnMode, BtnThumbL, BtnThumbR).
Testing ... (interrupt to exit)
Axes:  0:     0  1:     0  Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:off  9:off 10:off 11:off

Now, you can watch the response of all buttons and axes on your controls.