Re: [PATCH v2] pci: Add broken-GPE quirk for Lenovo Legion 16APH8 and 16AHP9 Nvidia GPUs

[Ryan Brue <ryanbrue.dev@gmail.com>]

On 8/21/26 3:04 PM, Lyude Paul wrote:
> On the Lenovo Legion Slim 5 16APH8 and 16AHP9, the firmware appears to enjoy
> firing a GPE on the parent PCIe port of the nvidia GPU very shortly after the
> GPU enters D3Cold. This means that every time the GPU is runtime suspended,
> ACPI firmware immediately wakes up its parent PCIe port, which then wakes up
> the GPU. Once it falls asleep again, the cycle repeats.
>
> See: https://github.com/NVIDIA/open-gpu-kernel-modules/issues/905
>
> Note, this bug doesn't require Nvidia's driver. It happens on nouveau and
> nova as well, and it even seems possible for this to happen without any
> driver loaded.
>
> This seems to simply be a bug. Luckily, there is nothing that we actually
> need ACPI wakeup events for on the GPU. Events such as display connector
> hotplug events in D3Cold come through as ACPI_VIDEO events which aren't
> affected by this quirk.
>
> Reported-by: Ryan Brue <ryanbrue.dev@gmail.com>
> Co-authored-by: Ryan Brue <ryanbrue.dev@gmail.com>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
> Cc: stable@vger.kernel.org
> Fixes: https://github.com/NVIDIA/open-gpu-kernel-modules/issues/905
>
> ---
> V2:
> * Don't forget to actually use parent_adev with acpi_remove_pm_notifier()
> * Check if parent_adev is NULL (could happen if booted with acpi=off), just
>    consider it a no-op if it is.
> * Base the patch off Linux master instead, I based it off drm-misc-next by
>    mistake because I'm too used to working on DRM drivers :).
>
>   drivers/pci/quirks.c | 79 ++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 79 insertions(+)
FWIW, this has been tested by me, with positive results, on my Lenovo 
Legion Slim 5 16APH8. Not sure if this warrants a Tested-by trailer 
since I'm a co-author, but just in case.

In the thread [1], we have had another user report positive results on 
their 16AHP9 (note that Lenovo seems to have switched the P and the H 
around for the laptop one generation up for some reason). Said user 
tested on both OpenRM and nouveau on top of kernel 7.1.10.

This means we have tested 16APH8 on nouveau, and 16AHP9 on both OpenRM 
and nouveau.

[1] 
https://github.com/NVIDIA/open-gpu-kernel-modules/issues/905#issuecomment-5444071160