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Increase size of dmesg buffer?

I'm trying to debug some acpi stuff on a fairly large system, and the default 32KB of "NVRAM" dmesg space does't seem to be enough - some of the important early stuff gets rolled-over before I can capture it.

So, it there some undocumented option that can be used to increase the allocated space? Is there any limitation on how much space can be used?

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