ACPI and the various Nforce2 chipsets don't play well together. ACPI is listed as "experimental" code in the kernel. My suggestion would be to pass ACPI=off to the kernel and avoid a lot of trouble.
If you don't need ACPI, give it a pass. The whole ACPI section of the kernel is being/has been reworked in 2.4.2X and in the 2.6.0 series and it doesn't appear to be ready for prime time with the Nforce2 boards.
Fix time frame - unknown by me. You can always read the kernel development threads and watch/contribute. http://hypermail.idiosynkrasia.net/linux-kernel/