Thanks.  So it seems the two problematic patches are as follows:

commit d5811e8731213f80c80d89e980505052f16aca1c
Author: Alex Deucher <[email protected]>
Date:   Sat Aug 13 13:36:13 2011 -0400

    drm/radeon/kms: don't try to be smart in the hpd handler

commit 73104b5cfe3067d68f2c2de3f3d4d4964c55873e
Author: Alex Deucher <[email protected]>
Date:   Tue Aug 9 17:09:06 2011 +0000

    drm/radeon/kms: don't enable connectors that are off in the hotplug
handler

Can I have you do one more test as well... could you try the latest
upstream v3.1-rc8 kernel?  I'd just like to also verify this hasn't
already been resolved with another patch.  I've posted a v3.1-rc8 kernel
at the following location:

http://people.canonical.com/~ogasawara/lp860868/v3.1-rc8/

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