Comment 18 for bug 849782
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bbfa235
(Get the code!)
A whole screen jitter is much more likely to be a FIFO underrun, which sadly are only reported with drm.debug=0x1 (along with every ioctl, so too noisy to be useful).
Can you attach your boot dmesg with drm.debug=0xe, I want to confirm if this hardware also fixed FIFO watermarks due to a silicon bug, in which case there is very little we can do (if it does turn out to be a FIFO issue).