acpi problems on inspiron 8200

hi:

I installed last stable kernel patch:
acpi-20021212-2.4.20.diff.gz

on an inspiron 8200 with bios revision A08.

When I load battery module with modprobe I get the following message:
ACPI: Battery Slot [BAT0] (battery absent)
ACPI-0189: *** Warning: buffer created with zero length in AML
-0073: *** Error: Ut_allocate: Attempt to allocate zero bytes
ACPI-0189: *** Warning: buffer created with zero length in AML
-0073: *** Error: Ut_allocate: Attempt to allocate zero bytes
ACPI-0189: *** Warning: buffer created with zero length in AML
-0073: *** Error: Ut_allocate: Attempt to allocate zero bytes
ACPI-0189: *** Warning: buffer created with zero length
in AML
-0073: *** Error: Ut_allocate: Attempt to allocate zero bytes
ACPI: Battery Slot [BAT1] (battery present)

It happens the same thing when executing acpi:
ACPI-0189: *** Warning: buffer created with zero length in AML
-0073: *** Error: Ut_allocate: Attempt to allocate zero bytes
//(repeated 8 times)
Battery 2: unkown, 0% //which isnt true

If close the laptop while using the X window system (using nvidia closed drivers), and I open it again I get the same message printed again and again in all consoles (/dev/tty*).

Special keys dont work.

Thanks in advance:

ALfonso Acosta

PS: If there's a way I can give more useful information about the problem, please let me know

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