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      Userland uses dispmanx for rendering graphics and video. With vc4graphics instead of westerosdispmanx, DRM (Direct Rendering Manager) module is used.  DRM is a subsystem of the Linux kernel responsible for interfacing with GPUs of modern video cards. DRM is a kernel module that gives direct hardware access to DRI clients. Westeros-dispmanx is suppressed , and westeros-drm is used for rendering.  Westeros-sink is enabled to use v4l2 by modifying soc-path to v4l2. 

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