OK, so you did see the firmware load error with one kernel. I think what
happened on the other was the same phenomenon as I described in bug
662389. Perhaps caused by rebooting instead of a cold start. There is no
reason to believe those two almost identical kernels would behave
differently with regard to the firmware loading bug.

Please do shutdown - start cycles (not just reboot) when testing
wireless. I have reason to believe it does make a difference. It throws
all test results into doubt if isn't done. Sorry for not mentioning this
earlier.

Mind to give the compat wireless rt2800pci another try, with renaming the other 
and with shutdown - start? I think it might very well work. After all the 
driver is reported to work for others for your hardware (Chris in his bug 
662288).
Best to recompile compat-wireless with debugging on before, so if it doesn't 
work you already have good logs to send with ubuntu-bug linux. And _do_ file 
your own report that way if it doesn't work.

If you also have a "hang on rt2800pci unload bug" (not just a "won't connect 
bug") then try working around that and then let's make a separate report for 
that.
There is another report of various hanging (on usb), with the workaround to use 
ifconcfig wlan0 down to avoid hanging.
http://rt2x00.serialmonkey.com/pipermail/users_rt2x00.serialmonkey.com/2010-December/002756.html

HTH

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https://bugs.launchpad.net/bugs/659143

Title:
  64bit-only: regression: kernels >=2.6.34: rt2800pci: load firmware Error with 
ralink [1814:0781]

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