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ac6cc1f97e
On subsequent hotplug connected event for a display
SurfaceFlinger destroys the previous framebuffers and
recreates them. When the new buffers are created
ComposerClient still holds a handle to the old buffers and
they are not destroyed. This way the new framebuffers
may get allocated on non continuous memory causing garbled
screens for the user.
Bug: 160112047
Bug: 169255692
Test: 1. limit cma ion memory to 32 MB
2. flash device
3. plug hdmi out and in
4. verify that the display image is not garbled
Change-Id: Idf7cdf7a070ffc83ecec34ac24c8a7d696f68aa6