i've got a problem with the nm-tool.
The situation looks like this. I've Ubuntu running on my laptop hp zv6000 with a Broadcom 4318 NIC and everything works fine as long as i stay in the range of the router.

If i move upstairs to another room i can't connect to the router any more altough i recieve the wlan signal with the aproximately strength of 30%.

Is it possible that the nm-tool has a signal strength barrier and it only can connect if the signal strength is higher than this barrier?

Maybe someone can help me. Would be great.