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0e1f616
(Get the code!)
Its seeming like the gpu-facing cache is the one that needs invalidation from the GL/gralloc driver, but is not being flushed. This is a CPU/GPU coordination issue, and the GPU-based scenarios all work through the same cache and do not experience this problem. If we use overlays, this is not an issue, as the MDP/CPU cache sync seems to work. (Unfortunately, overlays are not supported on external displays)