Re: [2.6.12-rc1][ACPI][suspend] /proc/acpi/sleep vs /sys/power/state issue - 'standby' on a laptop

[Pavel Machek <pavel@ucw.cz>]

Hi!

> I've noticed something strange with issuing 'standby' to the system:
> 
> when echoing "standby" to /sys/power/state, nothing happens, not even a log or 
> system activity to attempt standby mode.
> 
> However, trying echo "1" to /proc/acpi/sleep the system attempts to (standby) 
> and aborts:
> 
> [4295945.236000] PM: Preparing system for suspend
> [4295946.270000] Stopping tasks: 
> =============================================================================|
> [4295946.370000] Restarting tasks... done
> 
> We get no reason as to why it quickly aborts. 

> [4294672.065000] ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3])
> [4294676.827000] ACPI: (supports S0 S3 S4 S5)


...aha, but your system does not support S1 aka standby.
 
> What is '1' in /proc/acpi/sleep?  standby mode is not the same as suspend to 
> ram? when I put a normal desktop in standby mode its still 'on' but the hard 
> disk is put to sleep and the system runs in a lower power mode. 

stanby != suspend to ram.

				Pavel
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