There is no point in loading acpi_hp if nothing is showed in console after that.
Show output of related sysctls for acpi_video. Also show output, if any, after loading acpi_hp.
have you tried the updated acpi_video module ?
there were changes regarding the brightness commands about 2 weeks ago.
currently the driver is only modified on CURRENT, but I've posted a patch for STABLE on freebsd-acpi@
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