I'm not sure this is the same bug - but the timing and symptoms are the
same. In my case though DRM is failing. It says:

[    1.698032] [drm:drm_fill_in_dev] *ERROR* Cannot initialize the agpgart 
module.
[    1.698157] [drm:intelfb_restore] *ERROR* Failed to restore crtc 
configuration: -22
[    1.698216] DRM: Fill_in_dev failed.

If I logout from X, modprobe -r i915 drm,  modprobe i915 and then
restart X it's fast again. For the record: I'm an SSD user.

-- 
[karmic] Xorg 100% CPU utilization -- only after first login
https://bugs.launchpad.net/bugs/439138
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