fftest: Force feedback doesn't work in native mode

Greetz,

The wheel: Logitech Driving Force GT (DFGT)

fftest "does" help in applying the "constant effect" in the default mode.
As soon as I shift the wheel to "native mode" through the LtWheelConf
software, the fftest starts complaining
with " Function not implemented" message.

linux-dopx:/ # fftest /dev/input/event4
Force feedback test program.
HOLD FIRMLY YOUR WHEEL OR JOYSTICK TO PREVENT DAMAGES

Device /dev/input/event4 opened
Axes query:
Effects:
Number of simultaneous effects: 0
Upload effects[0]: Function not implemented
Upload effects[1]: Function not implemented
Upload effects[2]: Function not implemented
Upload effects[3]: Function not implemented
Upload effects[4]: Function not implemented
Upload effects[5]: Function not implemented
Enter effect number, -1 to exit

The platform:

linux-dopx:/ # cat /etc/issue && uname -a
Welcome to openSUSE 11.3 "Teal" - Kernel \r (\l).
Linux linux-dopx 2.6.34-12-desktop #1 SMP PREEMPT 2010-06-29 02:39:08
+0200 x86_64 x86_64 x86_64 GNU/Linux


Please guide.
-Anisha