I'm using a D-Link USB Wireless Adapter (DWA-140 rev. B1) on Ubuntu 11.04 (64-bit). It was installed and ran "out-of-the-box" with the rt2800usb driver. But I'm only getting 54 Mbps (IEEE 802.11g) when I run against my D-Link DIR-655 wireless router with firmware revision 1.11EU dated 2007/11/5. (Yes, I know it is an old one). Hardware version on the router is A2.
My system is a triple boot between Ubuntu 11.04, Ubuntu 10.04 and Windows XP SP3. Without doing anything with the hardware I'm able to get 270 Mbps when running Windows XP SP3, but only 54 Mbps running Ubuntu 10.04 (with driver rt2870).
Kernel version is 2.6.38-11-generic, and it is a 64 bits system with 8 GB RAM.
I've tried to run the windows driver using ndiswrapper, but still I'm only getting 54 Mbps speed.
The adapter is listed in the hardware compatibility list for Ubuntu (https://help.ubuntu.com/community/HardwareSupportComponentsWirelessNetworkCardsDlink#USB
Does the kernel support IEEE 802.11n, and do the driver support it as well ?
Could anyone help me with this ?