/proc/acpi/alarm -- does it work or not?

/proc/acpi/alarm -- does it work or not?

[Pavel Machek]

Hi!

I wanted to write some documentation about /proc/acpi/alarm, but
failed to make it work. I was putting machine to suspend-to-ram and
enabled everything in /proc/acpi/wakeup, still it would not do
anything. I even went to bios (thinkpad x32), set "RTC alarm" to
enabled and set time there. Nothing interesting
happened. /proc/acpi/alarm could not see most of my changes done in
BIOS, it only cleared century or something like that.

I checked that RTC readout in BIOS shows same thing as system timer.

Here are my attempts: [Commands were typed one-after-another where it
makes sense, and I left machine suspended for long enough -- timer
should have expired]

root@amd:/proc/acpi# cat alarm
2005-12-00 01:03:24
root@amd:/proc/acpi# echo '0-0-0 22:35:00' > alarm
root@amd:/proc/acpi# cat alarm
0005-12-00 22:35:00
root@amd:/proc/acpi# s2ram
Freezing cpus ...
Stopping tasks: ====================================|
ACPI: PCI interrupt for device 0000:02:01.0 disabled
ACPI: PCI interrupt for device 0000:02:00.1 disabled
ACPI: PCI interrupt for device 0000:02:00.0 disabled
radeonfb (0000:01:00.0): suspending to state: 2...
radeonfb (0000:01:00.0): resuming from state: 2...to 64er 10 Dec 2004
Restarting tasks... done
Thawing cpus ...
root@amd:/proc/acpi# date
Sun Dec 25 22:36:46 CET 2005
root@amd:/proc/acpi# cat alarm
0005-12-00 22:35:00
root@amd:/proc/acpi#

root@amd:/proc/acpi# cat alarm
0005-12-00 22:35:00
root@amd:/proc/acpi# echo '*-*-* 22:40:00' > alarm
root@amd:/proc/acpi# cat alarm
0005-12-00 22:35:00
root@amd:/proc/acpi# echo '2005-12-25 22:40:00' > alarm
root@amd:/proc/acpi# cat alarm
2005-12-25 22:40:00
root@amd:/proc/acpi# date
Sun Dec 25 22:37:53 CET 2005
root@amd:/proc/acpi# s2ram
Freezing cpus ...
Stopping tasks: =====================================|
ACPI: PCI interrupt for device 0000:02:01.0 disabled
ACPI: PCI interrupt for device 0000:02:00.1 disabled
ACPI: PCI interrupt for device 0000:02:00.0 disabled
radeonfb (0000:01:00.0): suspending to state: 2...
radeonfb (0000:01:00.0): resuming from state: 2...to 64er 10 Dec 2004
Restarting tasks... done
Thawing cpus ...
root@amd:/proc/acpi# date
Sun Dec 25 22:41:14 CET 2005
root@amd:/proc/acpi#

...so... what am I doing wrong? Is thinkpad x32 machine where it does
not work?
								Pavel

-- 
Thanks, Sharp!


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Re: /proc/acpi/alarm -- does it work or not?

[Karol Kozimor]

Thus wrote Pavel Machek:
[...]

Last time I checked (2.6.15-rc[45]) it worked fine -- I use it routinely
for S3 stress-testing (speaking of which, my machine has just failed to
resume after some 20 days of uptime and > 150 S3 cycles).

> Here are my attempts: [Commands were typed one-after-another where it
> makes sense, and I left machine suspended for long enough -- timer
> should have expired]
> 
> root@amd:/proc/acpi# cat alarm
> 2005-12-00 01:03:24
> root@amd:/proc/acpi# echo '0-0-0 22:35:00' > alarm

You got it mixed up. It's either
"2005-12-28 19:50:00" for absolute or
"+0000-00-00 00:01:00" for relative.

RTC IRQ counter is incremented whenever the timer triggers, regardless of
whether the system is up or down (my system, at least).

HTH, best regards,

-- 
Karol 'sziwan' Kozimor
sziwan-DETuoxkZsSqrDJvtcaxF/A@public.gmane.org


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