I think this is duplicate of bug #38915
It's not a problem with restricted driver...
I have really similar problems (ATI card too, radeon 7000) and I use the
*opensource* ("ati") driver, NOT the restricted one...
(the restricted driver doesn't support my card model anyway).
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Feisty freezes upon Logout or Switch user
https://bugs.launchpad.net/bugs/118605
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