The last line of the block below in drivers/acpi/Kconfig disables ACPI in most configs. Please check.
config ACPI
bool "Full ACPI Support"
depends on !X86_VISWS
depends on !IA64_HP_SIM
depends on IA64 || (X86 && ACPI_HT)
Regards
Michael
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2.4/2.6 kernel testing: ACPI PCI interrupt routing, PCI IRQ sharing, swsusp
2.6 kernel testing: PCMCIA yenta_socket, Suspend to RAM with ACPI S1-S3
More info on swsusp: http://sourceforge.net/projects/swsusp/