fix ACPI poweroff in 2.4.25-rc2

Hi Len,

based on your suggestions, I've read several bug reports about poweroff problems. I discovered that some people had to pass "nolapic" to make it operational. I tried the same on my VAIO and it worked. I also found that other people had to call the old acpi_suspend(ACPI_STATE_S5) code instead of the new one in acpi_power_off().

So I compared acpi_suspend() with the new code, and noticed that acpi_suspend() calls acpi_system_save_state() before doing acpi_enter_sleep_state_prep(). This function is responsible for sending PM events to all system devices, it seems. Thus, I inserted this call in acpi_poweroff() and it now works (on the VAIO at least). Does it make sense ? I have yet to test it on other systems, but if people with poweroff problems could try this patch on top of 2.4.25-rc2, it would be interesting. Perhaps it could get its way into mainline before 2.4.25 ? Please note that with this one, it's no longer necessary to use "nolapic" on the command line (for my notebook at least).

Regards,
Willy

@@ -95,6 +95,7 @@
 {
 	if (unlikely(in_interrupt())) 
 		BUG();
+	acpi_system_save_state(ACPI_STATE_S5);
 	acpi_enter_sleep_state_prep(ACPI_STATE_S5);
 	ACPI_DISABLE_IRQS();
 	acpi_enter_sleep_state(ACPI_STATE_S5);

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