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There is a known bug with dkms-3.0.5-1 where unsigned modules are concerned (most dkms modules are unsigned). There is also a valid bug fix for this attached to the upstream archlinux.org dkms package entry. I've applied the patch, personally, and it is the only one out there that actually fixes this issue. You can find it here:
https://bugs.archlinux.org/task/75212
The patch is attached near the bottom of the ticket. Reading the ticket entries will give you some understanding of the confusion over the issue.
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