Laptop blocking other computers on home WiFi routers
Solution 1:
It is likely that this is caused by a hardware fault or a driver problem. Try isolating the issue by acquiring or borrowing a USB wifi adaptor, and see if the problem goes away when you switch to using the external wifi.
If this fixes the problem, then you have a driver issue, and should file a bug. There are instructions on the steps to follow before filing a bug here: https://wiki.ubuntu.com/Kernel/LinuxWireless