Ok, so I did another more methodical test. 10 poweroff tries with each kernel all straigt to GDM and then poweroff via the menu. Sadly things don't get much clearer:
Unpatched Kernel: 10 tries, 10 reboots, 0 poweroff Patched Kernel: 10 tries, 5 reboots, 5 poweroff
Ok, so I did another more methodical test. 10 poweroff tries with each kernel
all straigt to GDM and then poweroff via the menu. Sadly things don't get much clearer:
Unpatched Kernel: 10 tries, 10 reboots, 0 poweroff
Patched Kernel: 10 tries, 5 reboots, 5 poweroff