Comment 13 for bug 246952

thank you.
as you wrote me, i tried option 1.
it tells me

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noi@noi-pc:~/Scrivania/ff-utils/ff-utils$ ./fftest /dev/input/event7
Force feedback test program.
HOLD FIRMLY YOUR WHEEL OR JOYSTICK TO PREVENT DAMAGES

Device /dev/input/event7 opened
Axes query:
Effects: Constant
Number of simultaneous effects: 16
Upload effects[0]: Invalid argument
Upload effects[2]: Invalid argument
Upload effects[3]: Invalid argument
Upload effects[4]: Invalid argument
Upload effects[5]: Invalid argument
Enter effect number, -1 to exit
1
Now Playing: Constant Force
Enter effect number, -1 to exit
2
Now Playing: Spring Condition
Enter effect number, -1 to exit
4
Now Playing: Strong Rumble
Enter effect number, -1 to exit
15
No such effect
Enter effect number, -1 to exit
9
No such effect
Enter effect number, -1 to exit
5
Now Playing: Weak Rumble
Enter effect number, -1 to exit

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effectively, i expected to see ff effects on the wheel, but they don't appear at all.
the work perfectly on win.

what can be wrong?