[2.5.51] Error on reading BAT1/state

I have an HP Omnibook XE3L notebook, running kernel 2.5.51: everything looks fine except for this messages when doing a cat on /proc/acpi/battery/BAT1/state (note that alarm and info have no problem):

exfldio-0122 [28] Ex_setup_region : Field [ACPW]
Base+Offset+Width 38+0+4 is beyond end of region [GPIO] (length 3B)
psparse-1103: *** Error: Method execution failed
[\_SB_.PCI0.LPCB.BAT1._BST] (Node c76755c8), AE_AML_REGION_LIMIT
acpi_battery-0206 [12] acpi_battery_get_statu: Error evaluating _BST
present: yes
ERROR: Unable to read battery status
exfldio-0122 [28] Ex_setup_region : Field [ACPW]
Base+Offset+Width 38+0+4 is beyond end of region [GPIO] (length 3B)
psparse-1103: *** Error: Method execution failed
[\_SB_.PCI0.LPCB.BAT1._BST] (Node c76755c8), AE_AML_REGION_LIMIT
acpi_battery-0206 [12] acpi_battery_get_statu: Error evaluating _BST

(This is with ACPI debug kernel option)

Bye

Stefano RIVOIR