Previr, could you also attach:
(1) the file /var/log/Xorg.0.log
(2) the output of the command:  xvinfo

Downgrading is a somewhat painful, I recommend you wait a bit more for a 
solution before resorting to that.
Meanwhile, a few tips for minimal-CPU playback:
(1) disable compiz (System→Preferences→Appearance→Desktop Effects) if it's 
enabled.
(1) use:
        mplayer -vm -vo x11 -framedrop <movie file>
    be prepared that -vm might leave you with a bad resolution on exit;
    if that happens, running:
        xrandr --auto
    or
        xrandr -s 1024x768
    (or whatever resolution you like) should help.

[sorry if this appears twice, it seems lauchpad ate my comment]

-- 
[i855] No Xv support for 82852/855GM (KMS bug)
https://bugs.launchpad.net/bugs/395932
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