Unable to power off via init 5 on Solaris 10 5/09

I installed Solaris 10 5/09 at my home PC. The mother board is Asus P5QL-EM. I have checked that all major hardware/chipsets are on HCL.
Now I have problem power off the machine via 'init 5'. 'Init 5' will stop all services, sync file system then leaves the machine in a state of black screen, no keyboard response. But the machine is still powered on, fans are running.
If I bring the system to single user mode by 'init s', then 'init5' from single user mode, sometimes I can power it off completely but not every time.
I guess the problem is between the bios acpi interface and the kernel drivers, but just do know from where to start the investigation. Any idea?

Sun's ACPI support is really sucks.
After I applied the latest kernel patch 141415-09, the trick I found stopped working. Any attempt to power off the system will just end up with a black screen. The last message I saw before the screen went black was
sync file system ... done
I then tested the Solaris 10 on another of my pc, that is about 3 years old. After the installation without apply any patch or tricks, system can be powered off properly. However, once I applied patch 141415-09, "init 5" stopped working.
All the pc I tested Solaris 10 here are able to be powered off properly by number of linux distro or even as simple as grub. So I created a work around it.
I created a small jfs partition and installed just GNU grub(no the grub from Sun) on it, then install Solaris 10 on the second fdisk partition. I created menu.lst
default saved
timeout 5
title Solaris
savedefault 1
rootnoverify (hd0,1)
chainloader +1
title Power off
savedefault 0
halt
The idea is to use GNU grub chain load Solaris grub and set default menu entry to "Power off" at the same time. When I need to power off the system, I issue "init 6" to reboot the system, then GNU grub will power off the system and at same time it set the default menu entry back to "Solaris". So next time, when the system waked up on Lan by the magic packet, it will boot Solaris. The down side of this solution is that I last the ability to reboot system.
It is really shame of Sun that as simple as grub is able to interact with ACPI and power off the system correctly.

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