You should not disable acpi, only the sdmmc driver.
Try disabling only sdmmc, and if problem is still present I could only suggest you try newer code (if the version you're trying out is NetBSD 6.0.1 try STABLE snaphot here) or to file a PR and wait for developer response.
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The best way to learn UNIX is to play with it, and the harder you play, the more you learn.
If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD
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