Seem to recall AMD started breaking DX9 functionality late last year... they promised to address it, IDK how far they got with it though (my laptop uses nvidia, so didn't really follow it). Was chatter about it in the Witcher community.
Try booting into your BIOS. It is hit and miss, but you MAY have an option to assign which adapter takes priority. Rare, but it has shown up here and there on some brands.
If all else fails, could look to see if you can downgrade to drivers released sometime before December 2017 (AMD driver versions reflect release time, so something like v17.11.4 or older), or check for newer drivers (Intel and AMD) to see if it helps resolve the issue.
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