problems with acpi_button in a 2.6 kernel running on a dell i8500

The button to turn the lcd screen off (as when the lid is closed) has isn't functional. Also, I found this error in Dmesg: Dell Inspiron with broken BIOS detected. Refusing to enable the local APIC. Other areas of ACPI seem to be functioning properly as the battery status (charging/discharging) and charge level are accurately reported.

Any help would be welcome

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