--- Comment #31 from ---
(In reply to Harry Wentland from comment #30)

> This probably happens because we advertise a backlight device if we have an
> eDP connector available, even if it's disconnected. See
> amdgpu_dm/amdgpu_dm.c?h=drm-next-4.17-wip#n3601 for more info.

OK, that makes sense, even if it is unfortunate. I'm fairly certain that my
HDMI and DP connectors are connected to the dGPU, even if I never use them. So
it makes sense that a backlight device get's created for that, I guess. Too bad
that the code commentary says that there is no way to check whether it is
actually needed, apparently.

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