Battery status problem (with ACPI)

[Peter Boy]

If I activate ACPI the gnome battery applet shows up with 0%.

If I check /proc/acpi/battery/BAT0/state I get:

present:                 yes
ERROR: Unable to read battery status

Is this usual for the current status of acpi support or is there an
error? (as mentioned in another message, I get a warning in dmsg about a
broken AML implementation)

Hardware: IBM Thinkpad T40p