Ok, I solved the problem setting 'polltype'=1 and 'power' to the correct value in the controller.Ini file (using HIDTest without a controller.ini to see the hex values).
[Dual Shock]
VID=054C
PID=0268
Polltype=1
DPAD=0
DigitalLR=0
MultiIn=0
A=2,02
B=2,04
X=2,01
Y=2,08
Z=2,80
L=2,10
R=2,20...