Re: Kernel Freeze with American Megatrends BIOS

[Roland Singer]

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.

>>> 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