I bought a HP Envy DV6 (Intel Centrino Wireless-N 2230 and Windows 8) and out of the box WLAN didn't work at all. I needed to update the drivers to the latest (16.0.5 which actually installed 15.5.6.48 drivers for this NIC).
After this the WLAN worked barely, I was able to connect to the access point (Elisa Cable Modem, then upgraded to ASUS RT-N66U which the same settings).
Then I did following settings:
802.11n Channel Width for band 2.4: Auto
802.11n Mode: enabled
Roaming agressiveness: 3. medium
Transmit Power: 5. Highest
bluetooth(r) AMP: disabled
* Allow the computer to turn off this device to save power: disabled (in Power Management tab)
* Disabled Bluetooth in the Device Manager
* Uninstalled PRO/Set Wireless Wi-Fi software
Also for the ASUS RT-N66U I used channel binding and WPA2-Personal with AES.
After this I was able to get 135Mbps uplink, and the speedtest.net gave me 50Mbps/4.5Mbps/16ms.
However, I have a 3 year old Asus laptop, and it gets 300Mbps uplink, and speedtest.net gives 75Mbps/4.5Mbps/9ms.
BEFORE I did all this tweaking, I was able to get quite a bad link and 5Mbps/0.35Mbps/16ms in speedtest.net
So clearly there is still something quite not right. The link speed is what worries me. Why the new HP is not getting 300Mbps like any other device in my home? And I don't know if I can enable Bluetooth on my system (remains to be seen once I get more time to test).
I hope this helps someone with the Centrino problems...
Cheers,
Sampsa
EDIT: When ever I enable the Intel Centrino Wireless Bluetooth 4.0 in the Device Manager, the laptop loses wireless connection and no connection can be made. So it's either shaky wireless or bluetooth. I'm taking this device back, this is just outrageous.