ACPI errors on Acer ASPIRE 7720 laptop, running FreeBSD 8.0 - CURRENT

[Antoine BRUNEL]

Hello

I'm getting theses while booting, and anytime I try to use ACPI (for 
example, battery status plugin):

acpi_ec0: EcRead: failed waiting to get data
ACPI Exception (evregion-0529): AE_NO_HARDWARE_RESPONSE, Returned by 
Handler for [EmbeddedControl] [20070320]
ACPI Error (psparse-0626): Method parse/execution failed 
[\\_SB_.PCI0.LPC_.BAT0._STA] (Node 0xc61e57e0), AE_NO_HARDWARE_RESPONSE
ACPI Error (uteval-0309): Method execution failed 
[\\_SB_.PCI0.LPC_.BAT0._STA] (Node 0xc61e57e0), AE_NO_HARDWARE_RESPONSE
battery0: <ACPI Control Method Battery> on acpi0
acpi_acad0: <AC Adapter> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
acpi_button1: <Sleep Button> on acpi0


I already tried to create a new DSDT.aml from here:

http://aceracpi.googlecode.com/svn/trunk/dsdt/acer/aspire/7720.dsl

but without succes.

My hw.acpi output:

hw.acpi.supported_sleep_state: S3 S4 S5
hw.acpi.power_button_state: S5
hw.acpi.sleep_button_state: S3
hw.acpi.lid_switch_state: NONE
hw.acpi.standby_state: S1
hw.acpi.suspend_state: S3
hw.acpi.sleep_delay: 1
hw.acpi.s4bios: 0
hw.acpi.verbose: 0
hw.acpi.disable_on_reboot: 0
hw.acpi.handle_reboot: 0
hw.acpi.reset_video: 0
hw.acpi.cpu.cx_lowest: C1
hw.acpi.thermal.min_runtime: 0
hw.acpi.thermal.polling_rate: 10
hw.acpi.thermal.user_override: 0
hw.acpi.thermal.tz0.temperature: 50.0C
hw.acpi.thermal.tz0.active: -1
hw.acpi.thermal.tz0.passive_cooling: 0
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0._PSV: -1
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._CRT: 110.0C
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.thermal.tz0._TC1: -1
hw.acpi.thermal.tz0._TC2: -1
hw.acpi.thermal.tz0._TSP: -1
hw.acpi.battery.life: 100
hw.acpi.battery.time: -1
hw.acpi.battery.state: 0
hw.acpi.battery.units: 1
hw.acpi.battery.info_expire: 5
hw.acpi.acline: 1

Already tried to boot with hw.acpi.osname="Windows 2001"

I'm running FreeBSD 8-0 Current, on an Acer 7720Z laptop, using most 
recent bios version from Acer: 1.34

FreeBSD brunel.pagan.fr 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Jun  2 
17:44:46 CEST 2008     root at brunel.pagan.fr:/usr/obj/usr/src/sys/CUSTOM  
i386

Can you please help me ??

Thanks in advance