Re: "reboot" swsusp mode leaves moon icon blinking

[Rafael J. Wysocki]

On Tuesday, 20 March 2007 17:50, Johannes Weiner wrote:
> Hi,
> 
> On Tue, Mar 20, 2007 at 01:32:45PM +0100, Pavel Machek wrote:
> > Date: Tue, 20 Mar 2007 13:32:45 +0100
> > From: Pavel Machek <pavel@xxxxxx>
> > To: "Rafael J. Wysocki" <rjw@xxxxxxx>,
> > 	kernel list <linux-kernel@xxxxxxxxxxxxxxx>
> > Cc: Andrew Morton <akpm@xxxxxxxx>
> > Subject: "reboot" swsusp mode leaves moon icon blinking
> > 
> > Hi!
> > 
> > ...and cause is really simple.
> > 
> > During resume, we do not know that "reboot" method was used, so we
> > assume plaform and make the led blink...
> 
> What does the "reboot" swsusp mean?
> 
> I am having this (or a similar problem):
> 
> 	echo shutdown > /sys/power/disk; echo disk > /sys/power/state
> 
> suspends normally.  But after a resume, the moon keeps blinking _and_
> I don't get ACPI events anymore.  At least all ibm-acpi features refuse
> to work (hotkeys, lcd-brightness, lid, ...).
> 
> I saved some /proc files (interrupts, acpi/processor/power, ...) and
> compared them before the suspend and after the resume but I could not
> find any differences.
> 
> > diff --git a/kernel/power/disk.c b/kernel/power/disk.c
> > index 873cdf8..dee0ff4 100644
> > --- a/kernel/power/disk.c
> > +++ b/kernel/power/disk.c
> > @@ -241,18 +241,11 @@ static int software_resume(void)
> >  		goto Done;
> >  	}
> >  
> > -	error = platform_prepare();
> > -	if (error) {
> > -		swsusp_free();
> > -		goto Thaw;
> > -	}
> > -
> 
> What is platform_prepare() actually good for when _resuming_? I tried to
> follow the function calls and it seems to disable a lot of thing instead
> of re-enabling them...?

Well, if you suspend using the platform mode, platform_finish() will be called
after the image has been restored (ie. by the "old" kernel).

Greetings,
Rafael


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