Unable to get the specific AP info via "iwlist wlan0 scanning"

Hi, i have a router with wireless on,and i want to get the ap information via
"iwlist wlan0 scanning".
BTW,i stop the ubuntu Network-manager service in order to connect to the ap
manually, but seems the scan result does't contain the ap info i want.
meanwhile, the cellphone can get the router ap info.
i start Network-manager service again,and the Network-manager doesn't find
the ap info of the router too.
the kernel of ubuntu is 6.30 and the madwifi driver is
madwifi-trunk-r4132-20100620.

Does anyone encounter same questions? could you give some advice? i try to
reboot the PC or router, but it doesn't work.
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