Raspberry pi qt full screen problems8/11/2023 DRM also handles setting the mode of the display, and exposes the Kernel Mode Setting interface to applications instead of letting them use the GPU. DRM abstracts away the command queue, memory management and other details of the GPU to allow several applications to use the GPU concurrently. To truly solve these issues, a kernel interface called Direct Rendering Management (DRM) was introduced. This was mostly worked around at first, for example the mode setting question was commonly addressed by running the X server as root and not setting the mode in any other application. This resulted in stability and concurrency problems whenever several applications attempted to interact with the GPU simultaneously. For instance, the X server would directly access the GPU device to set the resolution and color depth of the display (called a mode), and applications that performed rendering would manage the memory and framebuffers of the GPU. The earlier interfaces to GPUs in Linux left most of the work to the applications. Quick tour of accelerated rendering in Linux, X and Wayland In the kernel and OpenGL implementation
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