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Multi-GPU output support on Wayland #1

Xaver Hugl requested to merge zamundaaa/kwin:wayland-multi-gpu into master

There's still a lot to do:

  • refactor udev to list all available GPUs
  • refactor DrmBackend to use the outputs of all GPUs
  • make Atomic Mode Setting work properly on multiple GPUs (it doesn't on my secondary GPU)
  • create a new OpenGLBackend that contains multiple other backends
  • enable EglGbmBackend to copy buffers from other GPUs
  • enable EglStreamBackend to copy buffers from other GPUs
  • enable hotplugging of GPUs?

BUG: 425586 BUG: 417323

Edited by Méven Car

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