There are two sets of (open source) drivers for Ralink hardware. The in
kernel drivers of the rt2x00 project and drivers on Ralink's website.

There are two sets of drivers, the "legacy" drivers developed and open
sourced by Ralink (named *sta) and the in kernel drivers (mainly
rt2800usb and rt2800pci) developed by the rt2x00 project (looking a lot
at the legacy sources to make up for missing specs and getting answers
from Ralink engineers and also increasingly getting patches sent by
Ralink engineers). The Ralink drivers are monoliths (look at the size)
and do not fit the linux wireless infrastructure (mac80211 stack).

The last two Ralink legacy drivers have recently been deleted from the
kernel 3.0 staging directory. They continue to be available from the
Ralink website.

Like all newer Ralink pci hardware rt5390 hardware is supposed to be
supported by the rt2800pci driver. The legacy driver from Ralink's
website (or the suse repo, evidently) is a potential workaround in case
of bugs. It is obviously important that people using such workarounds
still file bugs against the rt2800pci driver so they can be found and
fixed for the in kernel driver.

Things have progressed with the rt2x00 projects driver:

http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commit;h=ea81966ccc2edd324c1fa382260a62a4400a032a
>rt2x00: Enable support for RT53xx PCI devices by default.
>
>Code seems to be feature-complete, so no reason to not enable
>these devices by default.
>
>Also, remove the sentence about the support for these devices being
>non-functional.

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https://bugs.launchpad.net/bugs/779484

Title:
  Ralink 5390 wireless driver not included in Natty

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