S3 resume and Wake events

S3 resume and Wake events

[Manpreet Singh]

Hi,

I am attempting to resume from S3 using a magic packet from an NIC. The NIC
asserts the PME# and the status bit gets set in the I/O controller, but it
turns out that the ACPI suspend code in the kernel disables *all* GPEs before
sleeping and so I can't wake the system up after it goes to sleep.

Tracing through the code (on the 2.6.4 stock kernel), at one point, the
function acpi_enter_sleep_state() calls acpi_disable_non_wakeup_gpes() which
disables all GPEs, even the ones that are potentially the wake-up events like
the PME_EN bit.

I am not sure if this is the case always or if there is a way to configure
the system to specify which GPEs are the candidates for wake-up.

I would appreciate your help and suggestions.

Thanks,
Manpreet.



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Re: S3 resume and Wake events

[Pavel Machek]

Hi!

> I am attempting to resume from S3 using a magic packet from an NIC. The NIC
> asserts the PME# and the status bit gets set in the I/O controller, but it
> turns out that the ACPI suspend code in the kernel disables *all* GPEs before
> sleeping and so I can't wake the system up after it goes to sleep.
> 
> Tracing through the code (on the 2.6.4 stock kernel), at one point, the
> function acpi_enter_sleep_state() calls acpi_disable_non_wakeup_gpes() which
> disables all GPEs, even the ones that are potentially the wake-up events like
> the PME_EN bit.

This needs some work. API should be invented to tell the kernel what
GPEs may wake us up.
									Pavel
-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]


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