Re: [PATCH] ACPI: processor: idle: Add DMI quirk for HA0QING A520

[Rafael J. Wysocki (Intel)]

On Fri, Oct 30, 2026 at 8:31 PM Munique Feitoza
<muniquefeitoz4@xxxxxxxxx> wrote:
>
> On the HA0QING A520 motherboard paired with AMD Ryzen 5000 series
> processors (such as the Ryzen 5 5500, Cezanne), entering deep ACPI
> C-states (C2/C3 mapped to I/O ports 0x414/0x415, corresponding to
> hardware C6) causes severe system instability, random hard freezes,
> and memory corruption ('BUG: Bad page state' and list_del corruption
> in page allocator / LRU paths) during idle transitions.
>
> Restrict max_cstate to C1 via processor_power_dmi_table for the
> HA0QING A520 board to prevent the processor from entering broken deep
> C-states and ensure system stability.
>
> Signed-off-by: Munique Feitoza <muniquefeitoz4@xxxxxxxxx>
> ---
>  drivers/acpi/processor_idle.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index e113bcbbb..49768b176 100644
> --- a/drivers/acpi/processor_idle.c
> +++ b/drivers/acpi/processor_idle.c
> @@ -105,6 +105,10 @@ static const struct dmi_system_id processor_power_dmi_table[] = {
>           DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
>           DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")},
>          (void *)1},
> +       { set_max_cstate, "HA0QING A520", {
> +         DMI_MATCH(DMI_BOARD_VENDOR, "HA0QING"),
> +         DMI_MATCH(DMI_BOARD_NAME, "A520") },
> +        (void *)1},
>         {},
>  };
>
> --

Applied as 7.5 material, thanks!