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Oh, apparently my inability to boot newer kernels on my Nitropad had nothing to do with the actual kernels. Somehow either Fedora or HEADS kept repeating the same two flags over and over in the kernel boot line (intel_iommu=igfx_off intel_iommu=on), so that at some point I think it overflowed some kind of sane limit. Trimming that down solved the issue.
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