I'll respond to #21 and #22 in parts for clarity:

Summary of my testing (once I had achieved some reliability):

Observed the failure (hang):
1. Kernel 2.6.35-25-generic  (Maverick)
2. Kernel 2.6.38-999-generic (kernel-ppa version 2.6.38-999.201102240912)
3. Kernel 2.6.35-25-generic (Maverick) + compat-wireless-2.6.38-rc4-1

No failure observed ("works for me")
1. Kernel 2.6.35-25-generic  (Maverick) + compat-wireless-2011-02-24
2. Kernel 2.6.38-999-generic (kernel-ppa version 2.6.38-999.201102240912) + 
compat-wireless-2011-02-24

So it is clear that the problem is resolved in post-2.6.38 changes.

I'm not sure where this leaves this bug:
1. I haven't logged against bugzilla.kernel.org yet as it appears to be 
resolved in the latest code
2. For this "ubuntu/launchpad bug" - any 
linux-backports-modules-compat-wireless-2.6.38 (when released) is unlikely to 
be a workaround, manual intervention would likely be required.

I haven't tried binary-searching compat-wireless versions to find which
change contributed the fix, as I'm not sure if that would be useful for
this (ubuntu) bug, and obviously not useful to kernel as it is already
fixed ;)

I'll follow up to this comment with the steps I used to get things
working on each version just so others finding this bug in Google will
have something reliable to work from.

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https://bugs.launchpad.net/bugs/662288

Title:
  rt2800pci freeze on module unload [maverick i386]

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