Re: [PATCH] ACPI: PM: Add unused power resource quirk for Casper Excalibur G900

[Rafael J. Wysocki (Intel)]

On Mon, Oct 5, 2026 at 7:50 PM Hakan Abay <hakan.abay84@xxxxxxxxx> wrote:
>
> On the Casper Excalibur G900, the NVIDIA discrete GPU and the second
> NVMe device become inaccessible when unused ACPI power resources are
> turned off during initialization.
>
> The failure is similar to the THUNDEROBOT ZERO case addressed by
> commit cd7ef20ba8c6 ("ACPI: PM: Add unused power resource quirk for THUNDEROBOT ZERO").
>
> Without the quirk, the NVIDIA GPU and the second NVMe device are left
> inaccessible in D3cold and attempts to transition them back to D0 fail.
>
> Add a DMI quirk for the affected Casper Excalibur G900 with NLCC 001
> mainboard to leave unused ACPI power resources on.
>
> With the quirk applied, the second NVMe device remains accessible. The
> NVIDIA GPU can enter D3cold while idle and subsequently return to D0
> for accelerated rendering.
>
> Link: https://bugs.kali.org/view.php?id=9891
> Assisted-by: LLM
> Signed-off-by: Hakan Abay <hakan.abay84@xxxxxxxxx>
> ---
>  drivers/acpi/power.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
> index 23a4e207a01e..2e79defca42b 100644
> --- a/drivers/acpi/power.c
> +++ b/drivers/acpi/power.c
> @@ -1121,6 +1121,18 @@ static const struct dmi_system_id dmi_leave_unused_power_resources_on[] = {
>                 }
>
>         },
> +       {
> +               /*
> +                * CASPER EXCALIBUR G900 laptop: Keep unused ACPI power
> +                * resources on to prevent the NVIDIA dGPU and NVMe #2
> +                * from becoming inaccessible.
> +                */
> +               .matches = {
> +                       DMI_MATCH(DMI_SYS_VENDOR, "CASPER BILGISAYAR SISTEMLERI"),
> +                       DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G900"),
> +                       DMI_MATCH(DMI_BOARD_NAME, "NLCC 001"),
> +               },
> +       },
>         {}
>  };
>
> --

Applied as 7.4 material, thanks!