randomly poking at headers, just

        dnf reinstall kernel-devel

made no difference to the problem

but, complete removal/install

        dnf remove kernel-devel
        dnf reinstall kernel-core
        dnf install kernel-devel dkms bison flex

did.

now, after nvidia install & subsequent modprobe,

        lsmod | grep nvidia
                nvidia_drm             69632  0
                nvidia_modeset       1200128  1 nvidia_drm
                nvidia              35332096  1 nvidia_modeset
                drm_kms_helper        303104  2 amdgpu,nvidia_drm
                drm                   630784  8 
gpu_sched,drm_kms_helper,nvidia,amdgpu,drm_ttm_helper,nvidia_drm,ttm

no idea why on a new/clean install this was necessary, or what diagnostic 
should've indicated the problem.

in any case, sorted.
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