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This is 100% reproduce-able for me (with ATI xf86-video-ati driver):
Start two X-Servers on vt1 and vt2, suspend, resume, change to vt2 (e.g. with Ctrl+F2), change back to vt1 (e.g. with Ctrl+F1)
--> screen freezes on image of vt2, nothing happens.
Workaround: change to vt3 (e.g. with Ctrl+F3) after image-freeze, afterwards everything is normal, switching VTs works again.
Maybe this is useful to someone or maybe someone even knows a better solution.
This doesn't happen with intel or nvidia chips for me.
(Intel: No problems at all. nvidia with nouveau: no change between two x-servers possible, nvidia with nvidia driver: in most cases ok, can crash with kwin + most recent kernel.)
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