I am using a Netgear N150 WNA1100 USB Adapter. The network driver is: ath9k_htc.

When I use Ubuntu 12.04 my wireless connection is much slower than when I use the WNA1100 with my Windows 7 installation on the same machine.

I have been researching this and the most common reason for this seems to be related to power management. However for me this is off by default.

I had entered a bunch of different commands and, at one stage, I got it to work at full power. But then I rebooted the machine and it went back to slow again.

After entering the different commands I was afraid that I may have messed something up, so I performed a fresh install of Ubuntu. I still have the same problem. My wireless connection is still much slower when using Ubuntu than when using Windows 7.

I am not sure what other info could help...

EDIT:

Ok, I have made live usb from the iso file I used to install Ubuntu on this pc, and ran it on my laptop. Still the same problem. However la[top works grand on cable.

I suppose this means that my wireless adapter or network driver can be eliminated as root of the problem..

So maybe to do with router itself? I use ZyXEL P-660HW-D1