Date:   Wed, 31 Aug 2016 14:34:44 +0200
From:   Peter Wu <peter@...ensteyn.nl>
To:     Roland Singer <roland.singer@...ertbit.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, emil.l.velikov@...il.com,
        "imirkin@...m.mit.edu >> Ilia Mirkin" <imirkin@...m.mit.edu>
Subject: Re: Kernel Freeze with American Megatrends BIOS

On Wed, Aug 31, 2016 at 02:21:31PM +0200, Roland Singer wrote:
> Am 31.08.2016 um 13:46 schrieb Peter Wu:
> > On Wed, Aug 31, 2016 at 01:27:36PM +0200, Roland Singer wrote:
> >> Am 30.08.2016 um 21:53 schrieb Peter Wu:
> >>> On Mon, Aug 29, 2016 at 11:02:10AM -0500, Bjorn Helgaas wrote:
> >>>> [+cc linux-acpi, linux-kernel, dri-devel]
> >>>>
> >>>> Hi Roland,
> >>>>
> >>>> I have no idea how to debug this problem.  Are you seeing something
> >>>> that suggests it may be a PCI problem?
> >>>
> >>> Yes I suspect there is an ACPI and/ or PCI problem, possibly
> >>> device-specific. Steps to reproduce on the affected machines:
> >>>
> >>>  1. Load nouveau.
> >>>  2. Wait for it to runtime suspend.
> >>>  2. Invoke 'lspci', this resumes the Nvidia PCI device via nouveau.
> >>>  3. lspci never returns, few moments later an AML_INFINITE_LOOP is
> >>>     reported.
> >>>
> >>
> >> I can confirm this. Same result on my machine.
> >>
> >> Here is a link to my ACPI tables:
> >> https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4722651/+files/Razer-Blade.tar.gz
> >>
> >> The specific source for the NVIDIA card can be found in the ssdt5.dsl file.
> >>
> >>
> >>     Method (PGON, 1, Serialized)
> >>     {
> >>         /* ... */
> >>
> >>         GPPR (PION, One)
> >>         If ((OSYS == 0x07D9))  /* Is Windows 2009 - In my case, setting to Windows 2009 only works! */
> >>         {
> > [..]
> >>         }
> >>         Else
> >>         {
> >>             LKEN (PION)
> >>         }
> >>
> >>         /* ... */
> >>         
> >>         Return (Zero)
> >>     }
> >>
> >>
> >>
> >> If not set to Windows 2009, then this is triggered:
> >>
> >>
> >>     Method (LKEN, 1, NotSerialized)
> >>     {
> > [..]
> >>     }
> > 
> > Yep, this is the same code. I stripped out irrelevant parts from the
> > previous mail for brevity.
> > 
> >> Is it possible to override the specific ACPI table functions (SSDT) in the DSDT?
> >> This way I could try to debug to find some more information...
> > 
> > See Documentation/acpi/initrd_table_override.txt and note that it is
> > important that the tables are really located at /kernel/firmware/acpi/
> > in your initrd (which must be the first, even before any possible
> > microcode updates).
> > 
> > What are you trying to do? For ACPI method tracing, see
> > Documentation/acpi/method-tracing.txt
> > 
> 
> Oh, you're right.
> 
> Thanks. Right now I am overriding the DSDT, but I am not able to override
> the SSDT, because I have to fix and compile all the SSDT files. There
> are too many compile errors... Wanted to find the exact line which
> is responsible for the hickup.

Have you disassembled with externs included? That is,

    iasl -e *.dat -d ssdtX.dat

If you are sure that the remaining errors are harmless, you can use the
'-f' option to ignore errors. You can also use the `-ve` option to
suppress warnings and remarks so you can focus on the errors.

If you look at my notes.txt, you will see that _OFF always executes the
same code. PGON differs. When the problem occurs, "Q0L0" somehow always
reads back as non-zero and LNKS < 7.

> >>> Yes I suspect there is an ACPI and/ or PCI problem, possibly
> >>> device-specific. Steps to reproduce on the affected machines:
> >>>
> >>>  1. Load nouveau.
> >>>  2. Wait for it to runtime suspend.
> >>>  2. Invoke 'lspci', this resumes the Nvidia PCI device via nouveau.
> >>>  3. lspci never returns, few moments later an AML_INFINITE_LOOP is
> >>>     reported.
> 
> I noticed following:
> 
> 1. Blacklist nouveau
> 2. Boot to GDM login manager (Wayland)
> 3. Switch to TTY with CTRL+ALT+FN2
> 4. Load bbswitch
> 5. Switch off GPU
> 6. run lspci -> no freeze
> 7. Switch to GDM
> 8. Login to a Wayland session (X11 won't work)
> 9. run lspci in a GUI terminal -> system freezes

Is nouveau somehow loaded anyway? All those extra components (X11,
Wayland, etc.) are unnecessary to reproduce the core problem. It occurs
whenever the device is being resumed (either via DSM/_PS0 or via power
resource PG00._ON).
-- 
Kind regards,
Peter Wu
https://lekensteyn.nl

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