https://bugs.freedesktop.org/show_bug.cgi?id=100399
--- Comment #8 from Michel Dänzer <mic...@daenzer.net> ---
Make sure nothing else (e.g. gdm in Wayland mode) is using the GPU you're
trying to unbind either. Something like
sudo lsof /dev/dri/*
shows which process is using which GPU device(s).
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