I use Debian/PPC on an old Mac Mini G4, it currently serve as a DLNA server (UPnP), no mouse or keyboard plugged.

I would like that my power button also serves to shutdown the box. Currently it does nothing, on recent x86 I would have used ACPI as described here.

However ACPI does not seems to be available from my G4 box (see for example here or here), only pbbuttonsd is available, see link.

I could not find whether or not any event (APM type?) is sent when pressing the power button. I know that I can hold the power button for 4s then the machine halt, but I would prefer a clean shutdown. As a last resort I could plug in a keyboard but I am looking for a solution without mouse or keyboard.

How would one do that ?

EDIT: Using web.archive.org I was able to read: http://web.archive.org/web/20110317165103/http://blog.blinker.net/2010/06/20/mac-mini-g4-homeserver-with-ubuntu-linux-10-04-wpa2/

I used the solution suggested:

I got this working on my G4 Quicksilver with Ubuntu by installing pbbuttonsd.

I had to modify /etc/pbbuttonsd.conf and change this line:

OnAC_KeyAction = none


OnAC_KeyAction = shutdown

I ran /etc/init.d/pbbuttonsd restart to restart the daemon, and then the power button worked to trigger a clean shutdown.

But this did not work for me, maybe there is a difference in between PowerBook and Mac Mini G4.


1 Answer 1


After digging into the source code, I was able to suggest the following patch on the pbbuttons mailing list, as seen here.

Turns out the code would only consider a power button press event in case:

if (n == 6 && ((intr[1] >> 3) & 1) != PBpressed) {

while the comment just above explains that:

/* n = 2 && intr[1] = 0x0c = %01100 power button on mac-mini */

so I simply changed it to:

if (n == 2 && intr[1] == 0x0c ) {

Now I can properly configure the OnAC_KeyAction to shutdown ! No need for a keyboard for a simple action like this now !

  • Thanks for the good work. Upvoting you (so you get a few extra reputation points for your care of the PowerPC platform)!
    – rbrito
    Jan 8, 2015 at 15:04
  • @rbrito thanks ! I'll even get back my own bounty points which I previously lost :)
    – malat
    Jan 8, 2015 at 16:33

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .