This might be fixed upstream in kernel 2.6.35-rc4. From the changelog:
commit 0888e883ea5ff8fac27e813256d6c1eaede5a234
Author: Alex Deucher
Date: Sat Jun 12 11:50:13 2010 -0400
drm/radeon/kms: fix bandwidth calculation when sideport is present
Fixes fdo bug 27529:
https://bugs.freedesktop.org/show_bug.cgi?id=27529
Reported-by: steckdenis
Signed-off-by: Alex Deucher
Signed-off-by: Dave Airlie
** Bug watch added: freedesktop.org Bugzilla #27529
http://bugs.freedesktop.org/show_bug.cgi?id=27529
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doesn't use the sideport memory on Gigabyte GA-MA790GP-UD4H
https://bugs.launchpad.net/bugs/397742
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