Re: ERROR: Writing to dgpu_disable cause Input/Output error

[Armin Wolf <W_Armin@gmx.de>]

Am 04.01.24 um 03:50 schrieb Athul Krishna:

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> Sent with Proton Mail secure email.
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> On Thursday, January 4th, 2024 at 1:05 AM, Armin Wolf <W_Armin@gmx.de> wrote:
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>> Am 03.01.24 um 19:51 schrieb Athul Krishna:
>>
>>> Hello,
>>> This is my first time reporting an issue in the kernel.
>>>
>>> Device Details:
>>>
>>> * Asus Zephyrus G14 (||||||GA402RJ)
>>> * Latest BIOS
>>> * Arch_x86_64
>>> * Kernel: 6.6.9
>>> * Minimal install using archinstall
>>>
>>> ISSUE: Using /dgpu_disable /provided by _asus-nb-wmi _to disable and
>>> enable dedicated gpu,
>>> causes system crash and reboots, randomly.
>>> 9/10 times writing 0 to dgpu_disable will produce an Input/Output
>>> error, but the value will be changed to 0, half the time system will
>>> crash and reboot. While writing 1 to it doesn't produce an error, I
>>> have observed system crash twice just after that.
>>>
>>> Steps to Reproduce:
>>>
>>> * Remove dpgu: echo 1 | sudo tee ../remove (dgpu path)
>>> * echo 1 | sudo tee /sys/devices/platform/asus-nb-wmi/dgpu_disable
>>> * echo 0 | sudo tee /sys/devices/platform/asus-nb-wmi/dgpu_disable
>>>
>>> * echo 1 | sudo tee /sys/bus/pci/rescan
>>>
>>> After writing 0 to dgpu_disable, there's an entry in journal about an
>>> ACPI bug.
>>> Output of 'journalctl -p 3' and lspci is attached.
>>
>> Hi,
>>
>> Can you share the output of "acpidump" and the content of "/sys/bus/wmi/devices/05901221-D566-11D1-B2F0-00A0C9062910[-X]/bmof"?
>> The bmof files contain a description of the WMI interfaces of your machine, which might be important for diagnosing the error.
>>
>> Thanks,
>> Armin Wolf
> Here's the output of 'acpidump > acpidump.out' and 'cat /sys/bus/wmi/devices/05901221-D566-11D1-B2F0-00A0C9062910[-X]/bmof'

Ok, it seems the ACPI code tries to access an object ("GC00") which does not exist.
This is the reason why disabling the dGPU fails with -EIO.

I am unfortunately not that knowledgeable when it comes to PCI problems, i CCed the linux-pci mailing list in hope that
they can better help you in this regard.

Maybe you can open a bug report on bugzilla.kernel.org so that things like ACPI table dumps, etc can be collected there?

Thanks,
Armin Wolf