Hello,

I'm using a snapshot of 4.8/amd64 (october, 6) and I'm not able to
shutdown properly the box using the power on/off button.

The machine is a Dell PowerEdge R610: 
bios bios0: vendor Dell Inc.
version "2.1.9" date 05/21/2010 bios0: Dell Inc. PowerEdge R610

full dmesg : http://user.lamaiziere.net/patrick/dmesg-open48.txt
acpidump : http://user.lamaiziere.net/patrick/acpidump.tar.gz

sensors:
# sysctl -a | grep sensor           
hw.sensors.cpu0.temp0=46.00 degC
hw.sensors.cpu1.temp0=46.00 degC
hw.sensors.cpu2.temp0=46.00 degC
hw.sensors.cpu3.temp0=46.00 degC
hw.sensors.cpu4.temp0=46.00 degC
hw.sensors.cpu5.temp0=46.00 degC
hw.sensors.cpu6.temp0=46.00 degC
hw.sensors.cpu7.temp0=46.00 degC
hw.sensors.mfi0.drive0=online (sd0), OK

The button works fine on FreeBSD, tell me if a FreeBSD dmesg will
be useful.

Thanks, regards.