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Date: Tue, 5 Apr 2005 14:56:20 -0400 (EDT)
From: Shawn Starr <shawn.starr@rogers.com>
Subject: Re: [2.6.12-rc1][ACPI][suspend] /proc/acpi/sleep vs /sys/power/state issue - 'standby' on a laptop
To: Pavel Machek <pavel@ucw.cz>
Cc: LKML <linux-kernel@vger.kernel.org>, acpi-devel@lists.sourceforge.net
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I'm working o

--- Pavel Machek <pavel@ucw.cz> wrote:
> 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.
>  

Right, so nothing should happen if I try to do it, but
something does only in /proc/acpi/sleep does the
system attempt S1 which is not supported.

Do you know if /proc/acpi/sleep will be deprecated in
favour of /sys/power/state? If so, this thread will be
moot ;)

> > 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.

Correct, I wanted to be sure.

> 
> 				Pavel
> -- 
> 64 bytes from 195.113.31.123: icmp_seq=28 ttl=51
> time=448769.1 ms         
> 
>