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Date: Wed, 2 May 2012 17:23:18 -0700
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Subject: Re: [RFC][PATCH 6/8] PM / Sleep: Implement opportunistic sleep
From: =?ISO-8859-1?Q?Arve_Hj=F8nnev=E5g?= <arve@android.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: NeilBrown <neilb@suse.de>, Linux PM list <linux-pm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Magnus Damm <magnus.damm@gmail.com>, markgross@thegnar.org,
        Matthew Garrett <mjg@redhat.com>, Greg KH <gregkh@linuxfoundation.org>,
        John Stultz <john.stultz@linaro.org>,
        Brian Swetland <swetland@google.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
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On Thu, Apr 26, 2012 at 2:52 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
...
> From: Rafael J. Wysocki <rjw@sisk.pl>
> Subject: PM / Sleep: Implement opportunistic sleep, v2
>
> Introduce a mechanism by which the kernel can trigger global
> transitions to a sleep state chosen by user space if there are no
> active wakeup sources.
>
> It consists of a new sysfs attribute, /sys/power/autosleep, that
> can be written one of the strings returned by reads from
> /sys/power/state, an ordered workqueue and a work item carrying out
> the "suspend" operations.  If a string representing the system's
> sleep state is written to /sys/power/autosleep, the work item
> triggering transitions to that state is queued up and it requeues
> itself after every execution until user space writes "off" to
> /sys/power/autosleep.
>

This does not work. Writing something other than "off" disabled auto
suspend for me.

...
> +static ssize_t autosleep_store(struct kobject *kobj,
> +                              struct kobj_attribute *attr,
> +                              const char *buf, size_t n)
> +{
> +       suspend_state_t state = decode_state(buf, n);
> +       int error;
> +
> +       if (state == PM_SUSPEND_ON
> +           && !(strncmp(buf, "off", 3) && strncmp(buf, "off\n", 4)))
> +               return -EINVAL;

Did you mean:
	if (state == PM_SUSPEND_ON
	    && strcmp(buf, "off") && strcmp(buf, "off\n"))
		return -EINVAL;

-- 
Arve Hjønnevåg