[Moderator edited to remove the entire quote of a previous message.]No sure if anyone responded but I also have an Acer Revo and had the same problem, CentOS 5:
I have a machine running a distribution of Turnkey Linux from Debian 7.2. The wireless card is a Ralink rt3090. I cannot get the machine to connect to a wireless network whatsoever, and need to get it to connect to a WPA2 protected one. Wired ethernet cables do function. I have installed WPA Supplicant, Rfkill, and Debian's Ralink driver.
My wifi speed drops from ~600 kbps to >50 kbps within a few seconds after connecting to the wifi. There is no problem with speeds on my windows 7 environment nor my phone. I have tried other distros like fedora and Gnome Ubuntu but the problem remains. Due to these low speeds i cannot update or even check what the problem is any help will be appreciated.