Re: 2.6.23-rc6: S4 and S5 no longer listed as supported on Toshiba Satellite A40

[Frans Pop <elendil@planet.nl>]

On Thursday 20 September 2007, Rafael J. Wysocki wrote:
> On Thursday, 20 September 2007 20:33, Alexey Starikovskiy wrote:
> > Frans Pop wrote:
> > > On Thursday 20 September 2007, you wrote:
> > >> Please try this patch.
> > >
> > > Works. All states are now listed again.
> > > I've not tested suspend to disk, but suspend to ram and power off
> > > work fine.
> > >
> > >> +printk(KERN_INFO PREFIX "(supports");

Note that this printk should be indented.

> > >>  #ifdef CONFIG_SUSPEND
> > >> -       printk(KERN_INFO PREFIX "(supports");
> > >>         for (i = ACPI_STATE_S0; i < ACPI_STATE_S4; i++) {
> > >
> > > Isn't there a risk now that we now end up printing
> > >    ACPI: (supports)
> > > if CONFIG_SUSPEND is not enabled and >S4 is not supported?
> > >
> > > Or, more probably, it would print
> > >    ACPI: (supports S5)
> >
> > Don't know what does it mean to support S0 exactly... :)

Agreed, though arguably the same goes for S5. I guess you could say they are 
all states that can be switched to.

> > > as it is unlikely that "off" is not supported :-)
> > >
> > > Maybe S0 should be taken outside the #ifdef and the loop as that
> > > state is also basically always there?
> >
> > Don't think it is worth the trouble. We already have this loop almost
> > completely unrolled, let's not make it complete mess...
>
> Well, you could use "(supports S0" instead of just "(supports". ;-)

After thinking about this a bit more, I think this does make sense for three 
(admittedly minor) reasons:
- consistency between messages with and without CONFIG_SUSPEND
- consistency with /proc/acpi/sleep
- avoiding unnecessary change from previous versions.

Please consider the attached patch which applies on top of Alexey's. Feel 
free to integrate it in his patch.

Signed-off-by: Frans Pop <elendil@planet.nl>

commit c4003376d234b990c371dad76fe3c3c6e8fe7965
Author: Frans Pop <elendil@planet.nl>
Date:   Thu Sep 20 22:27:44 2007 +0200

    S0 state is always supported

diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 638172f..85633c5 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -401,9 +401,11 @@ int __init acpi_sleep_init(void)
 	if (acpi_disabled)
 		return 0;
 
-printk(KERN_INFO PREFIX "(supports");
+	sleep_states[ACPI_STATE_S0] = 1;
+	printk(KERN_INFO PREFIX "(supports S0");
+
 #ifdef CONFIG_SUSPEND
-	for (i = ACPI_STATE_S0; i < ACPI_STATE_S4; i++) {
+	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 		status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 		if (ACPI_SUCCESS(status)) {
 			sleep_states[i] = 1;