pcmcia incompatibility

[paolo_veronelli]

I just bought a usb2 controller for pcmcia.
It works fine with my inspiron 8000,but fails to work on the old 
latitude lxpi.
The latitude has no pnp support so i have to start it with the card 
inserted.
the dmesg are the same on both machines,everything about the usb hub 
seems right,but the peripherals attached to the usb ports,are not  
given  power,and  after one minutes an error "device problem uhub 
disconnected".
Sounds like a hardware incompatibility,but I don't know if pcmcia has 
something to do with this.
Thanks for time,and help