ASUS Z9PE-D8 WS needs custom DSDT fix to properly shutdown (random)

[Daniele]

Running Ubuntu server 20.04.1 LTS (CLI only), after switching from other distro (Manjaro and Artix) which present the same issue; basically I tried the debian based, arch based and systemd free distro.

Issue description: issuing the command "shutdown -h now" or "poweroff -f" doesn't shutdown the system properly, the system hangs is S5.
This doesn't happen all the time, but randomly, let's say in about 30% of cases.
This happens not only with an installed system but also with the bootable usb installer.

How to replicate: I really don't know, it seems very random, without a pattern.

Motherboard: ASUS Z9PE-D8 WS with bios v. 5802 (dated 2015/10/15)
CPU: 2x intel Xeon E5-2687w (SR0KG)

After trying different proposed solutions for the "hanging at shutdown" issue (mostly by enabling/disabling things in grub and different kernels down to 4.9) I found out that only a DSDT fix solves the issue, and in particular in the _PTS method.

Basically this is the original part of the extracted DSDT:

    Method (_PTS, 1, NotSerialized) // _PTS: Prepare To Sleep
    {
        If (((Arg0 == 0x04) && (OSFL () == 0x02)))
        {
            Sleep (0x0BB8)
        }

        PTS (Arg0)
        DBG8 = Arg0
        WAKP [Zero] = Zero
        WAKP [One] = Zero
        WSSB = ASSB /* \ASSB */
        WOTB = AOTB /* \AOTB */
        WAXB = AAXB /* \AAXB */
        ASSB = Arg0
        AOTB = OSFL ()
        AAXB = Zero
        \_SB.SLPS = One
    }

The fix (or better call it workaround) includes a "do nothing" if Arg0 is 0x05 (state S5):

    Method (_PTS, 1, NotSerialized)
    {
       If (LEqual (Arg0, 0x05)) {}
       Else
       {
           Store (Arg0, DBG8)
           If (LAnd (LEqual (Arg0, 0x04), LEqual (OSFL (), 0x02)))
           {
               Sleep (0x0BB8)
           }

           PTS (Arg0)
           Store (Zero, Index (WAKP, Zero))
           Store (Zero, Index (WAKP, One))
           Store (ASSB, WSSB)
           Store (AOTB, WOTB)
           Store (AAXB, WAXB)
           Store (Arg0, ASSB)
           Store (OSFL (), AOTB)
           Store (Zero, AAXB)
           Store (One, \_SB.SLPS)
       }
    }

I really don't know why without injecting the DSDT fix it hangs randomly at shutdown.
I reported the issue to the kernel bugtracker too, but it seems there's not much movement there :D

I hope this can be fixed kernel side:
For reference, this is the link to the kernel bugtracker:
https://bugzilla.kernel.org/show_bug.cgi?id=210689

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1909115

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[Daniele (ghost82)]

Nothing to see in the log files, nothing is logged as the issue comes after logging to files.

[Kai-Heng Feng (kaihengfeng)]

A took a quick look and _PTS simply sets some variables for EC. So please contact Asus, because we don't know what EC expects.