Re: [PATCH] platform/x86: asus-wmi: don't warn when LPS0 is unavailable

[Denis Benato <denis.benato@linux.dev>]

On 9/15/26 19:15, Mario Limonciello wrote:
>
>
> On 9/15/26 11:32, Asai Neko wrote:
>> asus-wmi attempts to register its LPS0 suspend-to-idle callback during
>> probe. acpi_register_lps0_dev() returns -ENODEV when the LPS0 interface
>> is unavailable or explicitly disabled, but the driver treats this
>> expected condition as a registration failure and prints:
>>
>>    failed to register LPS0 sleep handler in asus-wmi
>>
>> This occurs on the ASUS ROG STRIX X670E-A GAMING WIFI with BIOS 2704.
>> The system exposes no PNP0D80 ACPI device and uses deep suspend. The
>> warning therefore misleadingly suggests a sleep-related malfunction
>> on a platform where the LPS0 callback is not applicable.
>>
>> Suppress the warning for -ENODEV while retaining it for other errors.
>> Leave callback registration and suspend/resume behavior unchanged.
>>
>> Signed-off-by: Asai Neko <sugar@sne.moe>
>> ---
>> Avoid the misleading ASUS WMI warning when LPS0 is unavailable.
>> The diagnosis and rationale are included in the patch commit
>> message.
>> ---
>>   drivers/platform/x86/asus-wmi.c | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
>> index a65090429ca7..f7d009b742b3 100644
>> --- a/drivers/platform/x86/asus-wmi.c
>> +++ b/drivers/platform/x86/asus-wmi.c
>> @@ -5421,8 +5421,11 @@ static struct acpi_s2idle_dev_ops asus_ally_s2idle_dev_ops = {
>>     static void asus_s2idle_check_register(void)
>>   {
>> -    if (acpi_register_lps0_dev(&asus_ally_s2idle_dev_ops))
>> -        pr_warn("failed to register LPS0 sleep handler in asus-wmi\n");
>> +    int ret;
>> +
>> +    ret = acpi_register_lps0_dev(&asus_ally_s2idle_dev_ops);
>> +    if (ret && ret != -ENODEV)
>> +        pr_warn("failed to register LPS0 sleep handler in asus-wmi\n", ret);
>>   }
>>     static void asus_s2idle_check_unregister(void)
>>
>> ---
>> base-commit: 587858367581b9c55c3690f4e63382ad622719d4
>> change-id: 20260916-asus-wmi-lps0-unavailable-warn-9a72be44b9ed
>>
>> Best regards,
>> -- 
>> Asai Neko <sugar@sne.moe>
>>
>>
> Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org> 
Reviewed-by: Denis Benato <denis.benato@linux.dev>