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Strange behaviour of automatic wake up
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publiosulpicio
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Joined: 31 Aug 2008
Posts: 150

PostPosted: Sat Dec 01, 2012 10:50 am    Post subject: Strange behaviour of automatic wake up Reply with quote

I would like to use my gentoo box as an alarm clock, using cron to start vlc. This is easy, but I do not want to have the computer on all the night. I found this how to very useful http://ubuntuforums.org/showthread.php?t=1714793 (it is for ubuntu, but it needs very small modifications to work in gentoo). Essentially, it uses /sys/class/rtc/rtc0/wakealarm to automatically turn on the computer at a specified time. If I do something like
Code:

sh -c 'echo 0 > /sys/class/rtc/rtc0/wakealarm'
sh -c 'echo `date "+%s" -d "+ 5 minutes"` >/sys/class/rtc/rtc0/wakealarm'

it works very well: I turn off the computer and it turn on by itself in 5 minutes.

The problem is that if the scheduled time for automatic wake up is for tomorrow, it does not work. When I set it everything seems ok
Code:

cat /sys/class/rtc/rtc0/wakealarm

is correct, but the computer does not wake up. The strange thing is that cat /sys/class/rtc/rtc0/wakealarm reports random alrm_time and alrm_date if I check them after the scheduled time (they were correct when I turned off the pc). This happens even if the scheduled time is a few hours in the future (but in the next day), it seems something happens at midnight (or in the night).

Any ideas on how to solve this? Thank you!
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publiosulpicio
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Joined: 31 Aug 2008
Posts: 150

PostPosted: Sat Dec 01, 2012 11:18 am    Post subject: Reply with quote

I found the the problem is not midnight or something like that. It seems that the automatic wake up works only if I turn off the computer and I do not turn it on until it does this automatically. If I set the wake up, turn off and turn on and then turn off another time (of course everything happens before the scheduled time) then it won't turn on on.
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