Ok, this is kinda weirdo and not easy to explain. After the latest updates, I've noticed that my smartphone and other devices can't connect to the internet when my Ubuntu is running and connected via Wi-fi. After lots of testing (including changing my router) I discovered it's "Ubuntu's fault": other devices have access to the internet only when Wi-fi is off and when my laptop runs on my Windows 7 partition. Also, other devices can connect if W7 is connected via wifi. Obviously, when I try to connect a device being far from my laptop, the problem disappears... This problem started about 10 days ago and I still haven't found a solution. I've also did a fresh installation 3 days ago, hoping to resolve. My idea is that it may be an issue with the latest kernels.
Any help is more than well accepted :)
PS: Sorry for my english, I'm an italian guy