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

[Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>]

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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