NOUVEAU_GEM_PUSHBUF with multi-GPU copy takes seconds
Original issue: https://github.com/swaywm/wlroots/issues/2636
Performing an OpenGL multi-GPU copy (from amdgpu to nouveau) stalls the process for seconds. NOUVEAU_GEM_PUSHBUF
blocks for a while.
Kernel version: 5.11.6-arch1-1