I have just installed Ubuntu 12.04 LTS along with the standard Windows 7 on my new HP pavillion g6 (AMD).
They both work fine but when I am running Ubuntu, the wifi signal strength shows low (occasionally disconnecting). If I run Windows 7, the signal is always very strong and it never disconnects.
How can that be and is there a fix?
Did you try this?
sudo iwconfig wlan0 power off
(Assuming wlan0 is the wireless interface you're running.)
This may fix the problem. This does not turn off your wireless card; rather, it disables power management for your wireless card. See man iwconfig for details.
I had the same problem on my HP.
I just changed default Ubuntu wireless driver to Broadcom in "System settings"-> "Software sources" -> "Additional drivers".
Everything works fine for now.
