Tested the ACPI Alarm (rtcwake) function in openSUSE 11.0. A very important feature for a media center.
It worked in openSUSE 10.2 but was disabled in openSUSE 10.3 due to issues. So my production media center is still running good old openSUSE 10.2.
I failed my first tests with openSUSE 11.0.
The /sys/class/rtc/rtc0/wakealarm file seems to stay empty when I write a time to it.
Could be because of the old/crappy bios. Need to test with some descent hardware.
If you got this working with openSUSE 11.0, please drop me a line.
If you got some free cycles and would like to test this:
Howto test:
This command should set your machine to wake in 5 minutes:
echo "+00-00-00 00:05:00" > /sys/class/rtc/rtc0/wakealarm
Check if the file is changed:
cat /sys/class/rtc/rtc0/wakealarm
Is there anything in the file?
Put SYSTOHC="no" in /etc/sysconfig/clock so that the bios clock is not touched when you shutdown.
Does it wakeup?
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2 comments:
Did you find a way to make this work?
I agree this is a key feature for a "green" media center...
Great job, BTW!
Moosy, I've managed to get this working. I had a similar problem as you in that I couldn't echo anything to wakeupalarm.
I tried the rtcwakeup command but that didn't work either.
Finally tried this:
echo 0 > /sys/class/rtc/rtc0/wakealarm
echo `date '+%s' -d '+ 5 minutes'` > /sys/class/rtc/rtc0/wakealarm
from http://www.mythtv.org/wiki/index.php/ACPI_Wakeup
and it worked. I don't know why though.
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