I'm experiencing the same issue on my laptop Samsung NC10 with BT5 R1 (KDE) installed on a live USB. My kernel version is 188.8.131.52
For the record : on BT4 I was able to power off my laptop by pressing the power button as soon as I logoff from KDE.
So I first try to modify the system settings like the following :
1. Open System Settings.
2. Go to Advanced>>Power Management.
3. Select "Edit Profiles" and choose the current profile. (In KDE 4.4, the default profile is "Powersave.")
4. Select "Shutdown" as the action for "When power button is pressed."
5. Press Apply.
but it was inefficient, the tip works only when KDE is started from KDM (and not from the startx command and the power button works only when KDE is running.
Then I used the output of lsmod command to check if the button module is loaded or not :
In my case the button module is not loaded ( ->the previous command didn't return any output), so I tried to load it manually with modprobe :Code:lsmod | grep button
Code:modprobe buttonStill nothing.Code:lsmod | grep button
At last, I used the following
And unfortunately this command returns no line. It seems the ACPI is not compiled on my kernel.Code:dmesg | grep '^ACPI:'
To be honest, I'm a bit lazy about kernel recompile, and I will try to get and install the ACPI package instead.
(as soon as I get an access to my home access point with WPA wireless encryption. I still have a lot of work to set up Backtrack )
Some Internet resources resulting from my piece of investigation :