Few days back, I was needing a wifi 54G key. Having an old OvisLink Wifi 54G 802.11b/g USB key, I tried to use it under Ubuntu Precise 12.04.
This key is using a Ralink RT2572T which is recognised out-of-the-box by Ubuntu 12.04. But it doesn't work as expected.
Wifi connection takes place, but sometimes the card doesn't get DHCP address and most of the time data stream stops for few seconds, and then restart.
Also, under encrypted networks, the data can't succeed to get thru. In fact, these troubles come from 2 functionnalities :
- power management, which needs to be disabled
- hardware encryption, which also needs to be disabled
This article explains how to setup these 2 tweaks to get a fully working Ralink RT2572T wifi adapter under Ubuntu Precise 12.04.
It has been tested successfully on Ubuntu 12.04 i386 version with original 3.2.0-23 and latest 3.8.10 kernels.