Sonypi command failed

Hello, 

I have a Sony Vaio PCG-FR215S.
When I modprobe the sonypi module I obtain the following messages in
dmesg:

sonypi command failed at sonypi.c : sonypi_call1 (line 189)
sonypi command failed at sonypi.c : sonypi_call2 (line 199)
sonypi command failed at sonypi.c : sonypi_call2 (line 201)
sonypi command failed at sonypi.c : sonypi_call1 (line 189)
sonypi: Sony Programmable I/O Controller Driver v1.20.
sonypi: detected type2 model, verbose = 2, fnkeyinit = off, camera =
off, compat = off, mask = 0xffffffff, useinput = on
sonypi: enabled at irq=11, port1=0x1080, port2=0x1084
sonypi: device allocated minor is 63
Sony VAIO Jog Dial installed at input event device #1.

The module inserts in the kernel correctly but I cannot control my LCD
brightness and the other parameters: 

[root@portatileleo spicctrl-1.6]# ./spicctrl -b=10
[root@portatileleo spicctrl-1.6]# ./spicctrl -b=50
[root@portatileleo spicctrl-1.6]# ./spicctrl -B
0
[root@portatileleo spicctrl-1.6]# ./spicctrl -p

[root@portatileleo spicctrl-1.6]#

Probably I'm wrong in something.....
Any help?
Thanks,

Leonardo