s4bios: does anyone use it?

s4bios: does anyone use it?

[Pavel Machek]

Hi!

Is there single user of s4bios? It used to work for me 4 notebooks
ago, but I never really used it. I think I'm the only person that ever
seen it working, but I could be wrong. Is there anyone using s4bios in
2.6.11?

If not, I guess we should remove that code from kernel. It is not
usefull, and it is likely broken.
								Pavel
-- 
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!


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Re: s4bios: does anyone use it?

[Brice Goglin]

Pavel Machek a écrit :
> Hi!
> 
> Is there single user of s4bios? It used to work for me 4 notebooks
> ago, but I never really used it. I think I'm the only person that ever
> seen it working, but I could be wrong. Is there anyone using s4bios in
> 2.6.11?
> 
> If not, I guess we should remove that code from kernel. It is not
> usefull, and it is likely broken.
> 								Pavel

Hi Pavel,

I always suspend my Compaq Evo N6OOc to disk using "echo 4b > /proc/acpi/sleep".
I don't remember the reason why I originally did choose this one instead of S4.
I just checked that S4 and S4Bios work the same on 2.6.11-mm1 (even with my
PCMCIA wireless card connected, great!).
 From what I remember, I didn't see any difference between S4 and S4Bios in
recent vanilla kernels.

By the way, it seems that Radeon makes suspend slower because it needs
to be blanked or something like that. Is there any way to avoid this ?

Regards

Brice


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Re: s4bios: does anyone use it?

[Pavel Machek]

Hi!

> >Is there single user of s4bios? It used to work for me 4 notebooks
> >ago, but I never really used it. I think I'm the only person that ever
> >seen it working, but I could be wrong. Is there anyone using s4bios in
> >2.6.11?
> >
> >If not, I guess we should remove that code from kernel. It is not
> >usefull, and it is likely broken.
> >								Pavel

> I always suspend my Compaq Evo N6OOc to disk using "echo 4b > 
> /proc/acpi/sleep".
> I don't remember the reason why I originally did choose this one instead of 
> S4.
> I just checked that S4 and S4Bios work the same on 2.6.11-mm1 (even with my
> PCMCIA wireless card connected, great!).
> From what I remember, I didn't see any difference between S4 and S4Bios in
> recent vanilla kernels.

Can you try cat /proc/acpi/sleep? If there's no difference between S4
and S4bios, than you are probably just using plain S4...

> By the way, it seems that Radeon makes suspend slower because it needs
> to be blanked or something like that. Is there any way to avoid this ?

Yes, but it will take quite long to do it properly. pm_message_t
framework needs to go in, first.

								Pavel
-- 
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!


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Re: s4bios: does anyone use it?

[Brice Goglin]

Pavel Machek a écrit :
> Can you try cat /proc/acpi/sleep? If there's no difference between S4
> and S4bios, than you are probably just using plain S4...

puligny:~% cat /proc/acpi/sleep
S0 S1 S3 S4 S4bios S5

Where am I suppose to see a difference between S4 and S4Bios here ?


 From what I see in acpi_system_write_sleep in drivers/acpi/sleep/proc.c
4 uses software_suspend while 4b uses acpi_suspend(4)
(SOFTWARE_SUSPEND is set in my .config)
Is this code the right one ?

         /* Check for S4 bios request */
         if (!strcmp(str,"4b")) {
                 error = acpi_suspend(4);
                 goto Done;
         }
         state = simple_strtoul(str, NULL, 0);
#ifdef CONFIG_SOFTWARE_SUSPEND
         if (state == 4) {
                 error = software_suspend();
                 goto Done;
         }
#endif
         error = acpi_suspend(state);

> Yes, but it will take quite long to do it properly. pm_message_t
> framework needs to go in, first.

Ok, great! I'll be happy to test it soon :)

Brice

Re: s4bios: does anyone use it?

[Pavel Machek]

Hi!

> >Can you try cat /proc/acpi/sleep? If there's no difference between S4
> >and S4bios, than you are probably just using plain S4...
> 
> puligny:~% cat /proc/acpi/sleep
> S0 S1 S3 S4 S4bios S5
> 
> Where am I suppose to see a difference between S4 and S4Bios here ?

Hmm, your system says it supports s4bios. But if you can see 

Writing data to swap (XXX pages)... XXX %

then you are definitely using swsusp. Strange.

								Pavel

-- 
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!

Re: s4bios: does anyone use it?

[Brice Goglin]

> Hmm, your system says it supports s4bios. But if you can see 
> 
> Writing data to swap (XXX pages)... XXX %
> 
> then you are definitely using swsusp. Strange.

That's what I see.

Thanks,
Brice


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Re: s4bios: does anyone use it?

[Stefan Seyfried]

Brice Goglin wrote:

>  From what I remember, I didn't see any difference between S4 and S4Bios in
> recent vanilla kernels.

I have seen exactly the same thing and concluded that S4bios is broken.
Since it is tricky to set up (you usually need a special hibernation
partition or a special file in a FAT partition) and probably slow as
hell (at least if it has anything to do with the APM BIOS suspend to
disk routines, and i assume it does), i'd shed no tears if it would go
away ;-)
-- 
Stefan Seyfried, QA / R&D Team Mobile Devices, SUSE LINUX Nürnberg.

"Any ideas, John?"
"Well, surrounding them's out."

Re: s4bios: does anyone use it?

[Bruno Ducrot]

On Sat, Mar 05, 2005 at 08:14:05PM +0100, Pavel Machek wrote:
> Hi!
> 
> Is there single user of s4bios? It used to work for me 4 notebooks
> ago, but I never really used it.

I don't have anymore my toshiba laptop where S4 bios was first
implemented.

> I think I'm the only person that ever
> seen it working, but I could be wrong.

You are indeed wrong.

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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Re: s4bios: does anyone use it?

[Pavel Machek]

Hi!

> > 
> > Is there single user of s4bios? It used to work for me 4 notebooks
> > ago, but I never really used it.
> 
> I don't have anymore my toshiba laptop where S4 bios was first
> implemented.
> 
> > I think I'm the only person that ever
> > seen it working, but I could be wrong.
> 
> You are indeed wrong.

Okay, so we had 2 users in past but have 0 users now? :-).

								Pavel
-- 
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!


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Re: s4bios: does anyone use it?

[Bruno Ducrot]

On Mon, Mar 07, 2005 at 09:44:01PM +0100, Pavel Machek wrote:

> Okay, so we had 2 users in past but have 0 users now? :-).

I don't know.  I remember having at least one positive feedback one or
two years ago, but this was for an old 2.4 kernel (does that count ?),
maybe if that guy switched to 2.6 there will be then one user now using
S4bios under 2.6 who knows :)

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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RE: s4bios: does anyone use it?

[Li, Shaohua]

Hi,
>> >
>> > Is there single user of s4bios? It used to work for me 4 notebooks
>> > ago, but I never really used it.
>>
>> I don't have anymore my toshiba laptop where S4 bios was first
>> implemented.
>>
>> > I think I'm the only person that ever
>> > seen it working, but I could be wrong.
>>
>> You are indeed wrong.
>
>Okay, so we had 2 users in past but have 0 users now? :-).
I wonder how could anyone use S4BIOS in 2.6.11. S4 and S4b all came into
'enter_state'. and in acpi_sleep_init:

		if (i == ACPI_STATE_S4) {
			if (acpi_gbl_FACS->S4bios_f) {
				sleep_states[i] = 1;
				printk(" S4bios");
				acpi_pm_ops.pm_disk_mode =
PM_DISK_FIRMWARE;
			}
			if (sleep_states[i])
				acpi_pm_ops.pm_disk_mode =
PM_DISK_PLATFORM;
		}
That means we actually can't set PM_DISK_FIRMWARE (always set
PM_DISK_PLATFORM). Is this intended? If no, .pm_disk_mode should be a
mask.

Thanks,
Shaohua


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Re: [ACPI] s4bios: does anyone use it?

[Pavel Machek]

Hi!

> >Okay, so we had 2 users in past but have 0 users now? :-).
> I wonder how could anyone use S4BIOS in 2.6.11. S4 and S4b all came into
> 'enter_state'. and in acpi_sleep_init:
> 
> 		if (i == ACPI_STATE_S4) {
> 			if (acpi_gbl_FACS->S4bios_f) {
> 				sleep_states[i] = 1;
> 				printk(" S4bios");
> 				acpi_pm_ops.pm_disk_mode =
> PM_DISK_FIRMWARE;
> 			}
> 			if (sleep_states[i])
> 				acpi_pm_ops.pm_disk_mode =
> PM_DISK_PLATFORM;
> 		}
> That means we actually can't set PM_DISK_FIRMWARE (always set
> PM_DISK_PLATFORM). Is this intended? If no, .pm_disk_mode should be a
> mask.

pm_disk_mode is settable using /sys/power/disk, no? Anyway, what about
this, then?

--- clean/Documentation/feature-removal-schedule.txt	2005-01-22 21:24:50.000000000 +0100
+++ linux/Documentation/feature-removal-schedule.txt	2005-03-08 10:18:05.000000000 +0100
@@ -15,3 +15,8 @@
 	against the LSB, and can be replaced by using udev.
 Who:	Greg Kroah-Hartman <greg@kroah.com>
 
+What:	ACPI S4bios support
+When:	May 2005
+Why:	Noone uses it, and it probably does not work, anyway. swsusp is
+	faster, more reliable, and people are actually using it.
+Who:	Pavel Machek <pavel@suse.cz>


								Pavel
-- 
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!

Re: s4bios: does anyone use it?

[Stefan Seyfried]

Pavel Machek wrote:
> Hi!
> 
>> >Okay, so we had 2 users in past but have 0 users now? :-).
>> I wonder how could anyone use S4BIOS in 2.6.11. S4 and S4b all came into
>> 'enter_state'. and in acpi_sleep_init:
>> 
>> 		if (i == ACPI_STATE_S4) {
>> 			if (acpi_gbl_FACS->S4bios_f) {
>> 				sleep_states[i] = 1;
>> 				printk(" S4bios");
>> 				acpi_pm_ops.pm_disk_mode =
>> PM_DISK_FIRMWARE;
>> 			}
>> 			if (sleep_states[i])
>> 				acpi_pm_ops.pm_disk_mode =
>> PM_DISK_PLATFORM;
>> 		}
>> That means we actually can't set PM_DISK_FIRMWARE (always set
>> PM_DISK_PLATFORM). Is this intended? If no, .pm_disk_mode should be a
>> mask.
> 
> pm_disk_mode is settable using /sys/power/disk, no?

No, it isn't. That was my original point: you can write "firmware" into
it, but it has no effect. This probably was a side-effect of the "make
firmware mode not default" patch from a year ago.
But the real question is: what is firmware mode good for today? Is there
a single machine where firmware mode once worked, but swsusp does not
work today?

> Anyway, what about this, then?
> 
> --- clean/Documentation/feature-removal-schedule.txt	2005-01-22 21:24:50.000000000 +0100
> +++ linux/Documentation/feature-removal-schedule.txt	2005-03-08 10:18:05.000000000 +0100

Fine with me. I think it cannot work since ~one year (when we changed
the default from "firmware if available" to "shutdown always", the code
piece cited above) and nobody complained until now, so it won't be
missed IMO.
-- 
Stefan Seyfried, QA / R&D Team Mobile Devices, SUSE LINUX Nürnberg.

"Any ideas, John?"
"Well, surrounding them's out."


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