Re: How to get /proc/acpi/alarm to work?

[Hanno Mueller <sockpuppet@hanno.de>]

Li, Shaohua schrieb:
> Is it possible you could try the patch at 
> http://bugzilla.kernel.org/show_bug.cgi?id=5833?
> Christian Lupien's patch made a lot of improvements on alarm.

Thanks, but no, that didn't solve the problem.

Let me rephrase the description. My BIOS has a different ACPI alarm
value than the value stored in /proc/acpi/alarm.



I can set the RTC alarm wakeup in the BIOS's ACPI settings to:

  enabled: yes
  day:     18
  hour:    15
  minute:  10
  second:  30

If I look at /proc/acpi/alarm, it doesn't show me "****-**-18 15:10:30"
as one would expect, but a different value.

When doing

  echo "2006-01-18 15:20:45" > /proc/acpi/alarm

I get (with Christian's patch):

  cat /proc/acpi/alarm
  "****-**-** 15:20:45 +int (2006-01-18 10:50:12)"

Now, after rebooting, the BIOS _still_ shows 15:10:30 on day 18 in its
ACPI settings.


So on my system, the BIOS's RTC alarm wakeup ACPI setting appears to be
something different than what /proc/acpi/alarm has access to.

Also, the /proc/acpi/alarm setting does not wake the system from S5,
while the BIOS setting can. And the BIOS can handle the day's number as
a wakeup setting, while /proc/acpi/alarm cannot.

Any idea how to read and change the BIOS's RTC alarm wakeup from Linux?
I have read from users of other mainboards that it works for them
(including the day's number).

As I wrote before, the nvram-wakeup method does not work on this
mainboard, either.

Regards,

Hanno


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