51909f37ed6405c38f1c46a4012952be79031994 is the first bad commit
commit 51909f37ed6405c38f1c46a4012952be79031994
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Jun 5 14:54:55 2014 +0100

    sna: Skip marking the CRTC as damaged for TearFree
    
    As we have reorder the application of damage on a TearFree frontbuffer
    to before we attach the CRTC, we do not need to then schedule the update
    afterwards (until it gets drawn by the client).
    
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

:040000 040000 d82acb4264e9112b39d4f777eec23b6e677037e7 d57dd85b2b72d949469d950f8bcb7e8240c0730d M	src