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Date: Tue, 24 Mar 2009 15:33:55 +0200
From: Andriy Gapon <avg@icyb.net.ua>
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Subject: shutdown via  power button: "acpi: resumed at..."
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I noticed that sometimes I am getting "acpi: resumed at..." message on console and
in system log when I initiate system shutdown by pressing power button.
I think that the cause is in acpi_UserNotify("Resume") call and this call is only
found in acpi_EnterSleepState().

I see the following code in that function:
    case ACPI_STATE_S5:
        /*
         * Shut down cleanly and power off.  This will call us back through the
         * shutdown handlers.
         */
        shutdown_nice(RB_POWEROFF);
        break;

So it seems that it is expected that shutdown_nice() would return immediately.
I think it makes S5 a special case comparing to other states where return happens
upon resuming from the state.
In this case, maybe it is not necessary for S5 request to go through the
resume/wakeup half of acpi_EnterSleepState.

-- 
Andriy Gapon